I have more hope for EV repairability than for e.g. iPhones. Notice that right-to-repair laws followed tractor owners, not iPhone owners. The farmers felt the pain first. It's simply more important for a vehicle, where replacing is not nearly as cheap.
You can already buy random EV parts online. As automakers make more models and source more common parts for their cars to do this competitively, this aftermarket gets better and more useful. A fairly promising thing is the apparent popularity of EV conversions and home-brew EVs, so perhaps there will be some competition for e.g supplying full-on computer control systems with some serious capabilities. There are also more modifications people will conceivably want to do on their cars. I know someone whose petrol ute has a fridge under the canopy, powered by a solar panel on the roof and an extra battery. Nobody is out there drilling a hole in their iPhone to add a headphone jack, because it would be really bad, but you can do all sorts to cars without ruining the whole experience. The complexity and variability of what people want their cars to do leads to modifications and that demand will have to be met somehow. It's also the kind of strange demand that cannot be met by the big automakers alone.
As for reliability, I hope the market will continue to speak pretty loudly with their wallets on the importance of that. People care about it now, I have no reason to believe they'll stop.