It definately would be a dealbraker for me if it had ACC.
That thing never reacts like I react in the same situation. Away goes your defensive driving style. When you are approaching a red light, and there are cars in front of you, the ACC will just keep driving until it reaches the set distance, and then start braking. I would have long lifted my foot of the accelerator to let the friction slow down my van, with most of the times having a green light when I arrive, and never have to brake.
The same for cars in front of you turning off the main road, the ACC will slam on the brakes where I would just steer a little to the left or right to pass that vehicle without the need to brake.
And for lane keeping, it is just like an annoying passenger grabbing your steering wheel and pulling the wheel when you just want to avoid a pothole in the road, crossing the line.
Just normal CC should be standard in a campervan. ACC, lane and side assist as option, but NEVER as standard. Some people still can drive their selves.
What happens when someone hits your bumper on a car park? Your ACC sensor is adjusted, and will stop working, as will other functions nowadays.
When someone hits my bumper, worst case would be a smashed parking sensor, but I will still have my CC.
But that is just my humble opinion.