Not sure why living in the country makes it more difficult, its actually probably easier, charge at home no need to find a petrol station and fully charged every time you need it.
It's actually more difficult for city dwellers who don't have their own driveway.
I am also not sure you why buying one is such a bad idea, Tesla's have been about for 7 years now and they have retained their value better than an equivalent ICE.
They are more expensive to buy even with government grants but the lifetime cost is likely to be significantly lower;
VED is zero on an EV but a £40k alternative would like cost £450 a year for the first 5 years.
Fuel costs depend on how and where you charge but can be as low as 1p a mile compared to 12p or so for an ICE.
There is no need for an annual service.
For company car drivers there is currently zero BIK.
Sadly, not everyone living in the country has off road parking or the ability to home charge. However, that's beside the point as my comment was a reference to the levels of charging provision. If you can have your own charging point at home then everything should be Hunky-Dory. However, if like my brother in law, you live in a terraced house directly on the road, you will have to go elsewhere to charge your EV. He owns a Nissan Leaf. Unlike in the cities EV charging points aren't quite so numerous or closely spaced.
Teslas may well have been around for seven short years but I suspect that will make no difference to the average buyer. They are still way too expensive and don't expect the Government grants to last forever either. Also I doubt if whole life costs are of any interest to most buyers as they are most unlikely own it for that long. Instead, I suggest most buyers are likely to be more interested in the cost of purchase and running. There are of course cheaper alternatives but these are also very pricy for what they are. My point is that for me, it is still very early days for both the modern EV and the necessary infrastructure needed to make them viable for everyone.
EVs may well be zero rated for VED but don't expect that to last forever. Also, I read recently that at present most EVs are either sole or second cars with the main car still being an ICE. If this is true, I can't see most people wanting to blow upwards of £40k on a second vehicle. Given the current cost of the cheaper EVs, there are still ICE vehicles for sale that are much cheaper to buy and attract very low or zero rated VED.
EV fuel costs are undoubtedly an advantage but only at the moment. If there is a massive take up of EV vehicles in the next decade then expect the costs of recharging to rise sharply. In the mean time the extra cost of buying a EV over an equivalent ICE, will probably keep the latter running for a considerable time.
When you say that there is no need for an annual service, that may apply to the EV element but the rest of the vehicle is just the same as any other ICE vehicle. It will need servicing at some point. Tyres, brakes, steering, lighting and no doubt the electrical safety and integrity of the EV elements will need to be checked from time to time. I would suggest that given that most of the things checked during a service are nothing to do with the power unit, then service intervals won't differ much from an average ICE vehicle. As it is most vehicle manufacturers offer long life servicing on ICE vehicles which can mean only one service every other year. No, mark my words, an EV will require servicing and the dealerships will be ready and waiting to take your money. If regular servicing wasn't necessary then soon they will all be out of a job and that ain't gonna happen.
Finally, my post was specifically directed at the private buyer not business users.