What you hear from people "on the ground" is that ADA is written in a way that makes it very difficult to comply with.

An experienced ADA "predator" can find some technical violation in most any place of business, and make a profit suing for it. Normally, these technical flaws have no real impact on accessibility for actual disabled people. It's just a legal quirk.

Or so I've read/heard in a few places. I have no personal insight, so take this post FWIW!