Obviously we don't have ICE levels of data, but as far as available data that we do have, that battery uncertainty is probably unwarranted. Battery life seems to be dropping much slowly than early estimates predicted (and this is including vehicles with >100,000 miles, and >10 years of driving history). Risk acceptance is not a thing that has one right answer, so I won't try and say that people are wrong for how they are assessing this risk, but I know that I personally had zero compunctions at all when I recently bought a used EV, and just appreciated the price I was getting.

Now is probably the golden age for buying used EVs, because eventually this notion that the batteries are untrustworthy is going to go away (you can argue about whether this will occur because the technology improves vs. people will better realize where it already is, but it will happen).