Note all the posts by Beach owners explain how to store stuff, which fridge, which cooker etc, etc; and the paucity of posts from Ocean owners.
Why is that?
Maybe because, apart from not being able to carry 7 passengers, the Ocean just does it straight from the forecourt and can cope come rain come shine.
We are strange as we cook in our house and in our California and long gone are the days I want to cook my breakfast under a tailgate in horizontal rain when I can just lift the cooker lid, put the kettle on and cook my bacon & eggs in comfort in a French Aire listening to the radio.
Don't forget to factor in the equipment and storage systems that make the Beach work and unless you unload all that after each trip your probably carrying as much extra weight as an Ocean with its kitchen etc:.
Every thing you say is true W.G. however for the benefit of the OP, the differences are more complex than you have said and therefore worthy of further discussion.
As you have said, the SE/Coast/Ocean format is a ready to go design which is very attractive to potential owners. The showroom allure of the glossy fully fitted kitchen etc compared to the more utilitarian interior of the Beach is difficult to resist to the point that I suspect many potential buyers never consider the Beach to be a viable alternative.
For anyone considering a Beach,
@WelshGas is also correct in saying that the cost to equip it can also be substantial although it doesn't need to be. Pull out boot trays, compressor fridges, storage solutions, and kitchen pods are all very expensive add ons which will substantially increase your outlay. That outlay will have also included the cost of the basic Beach plus your chosen options which in the case of the Beach are disproportionally expensive. VW treat Beach owners as a cash cow in that respect so expect your options to push the cost of your Beach closer to Coast or even Ocean territory. When I ordered our last Beach I wanted a good spec and this was the result before discount and that's not including additional dealer fitted accessories:
So buying a well specced Beach compared to a Coast or an Ocean can be a very expensive proposition as potential buyers will quickly find out. That is why well optioned Beaches are so rare.
There is also the considerable research that's necessary to devise and in some cases make, your own preferred internal stowage system which may also require several revisions before you get it right. This is all hassle when compared to the slick, ready to go fully fitted alternative. So there will always be a very strong case for ignoring the Beach and buying the Coast/Ocean instead.
However, all campervans are a compromise and this is where the Beach is stongly worth considering. The biggest selling point with the Beach is it's flexibility. Flexibility that I suggest makes it a far better proposition for people who only wish to own one general purpose multi tasking family vehicle.
Yes, you can take up to six passengers with you, if you own the right version. You might not want to do that very often but it is just one very useful "string to it's bow". Nothing is fixed in a Beach which means that like me, you may well carry everything with you all of the time. However, it can all be removed thereby potentially making the whole rear of the vehicle available for any number of other uses. Having nothing fixed means no issues with getting at and repairing plumbing, gas or fridge related issues that occur from time to time and also no fragile fixtures and fittings to break. The Beach doesn't require the entire kitchen/wardrobe range to be removed in the event of near side accident damage. A problem that is often the case with the SE/Coast/Ocean. In fact the whole vehicle is far less complicated with no electro/hydraulic roof or electrc control devices to provide issues later on in life.
Using a beach as a camper van gives the occupants much more room in the rear. Also the front passenger seat occupant has the same extended leg room as the driver when the front seats are swivelled as there is no kitchen unit in the way. The down stairs bed is enormous, it's width not being compromised by the kitchen wardrobe layout.
Instead of a campervan with four seats and a fixed kitchen layout you have instead a much less complex vehicle that can do everything the former can do (subject to certain accessories e.g portable stove and fridge being provided) with any number of additional flexible possibilities. Less complexity should mean fewer issues and therefore fewer long term costs.
So if you buy an SE/Coast/Ocean you will be able to drive away in a fully fitted campervan with a good level of standard equipment and no further work to do. If you decide to buy a Beach with options you will be paying over the odds for the extra equipment and there will be additional costs involved in providing storage and cooking facilities etc. So it won't necessarily be a cheaper option and that should be fully understood before exploring the Beach variant.
The choice comes down to either "off the peg" or "tailor made". However, should you decide on the latter you will also be getting a far more flexible and arguably, more reliable product.