Compliance with the ADA is, legally, a case by case decision. As a practical matter, once they introduced guidelines (e.g. how quickly a manual door can close and still be considered accessible) businesses have relied on the guidelines, rather than making the individual accommodations the law actually requires - and compliance with the guidelines is treated as presumptive compliance with the law.
With those gone, it's back to a case by case basis. Could cost businesses money.
For example - as to the doors - the rate and angle of closure doesn't allow a relatively able-bodied person to get through the door without assistance, as I discovered when I broke my leg a few years ago. I was surprised because the building had just been renovated (significantly enough that it had to modify everything to ADA standards. So I looked them up, timed the door closure, and the angle at which the rapid close stopped. It was in compliance with the regs - but it was not accessible to people in walkers. Because of the regs, I wouldn't have been successful - they met the presumptive access standards. In the absence of the regs, I might be because I could prove, on a case by case basis, many of the rooms (including the bathroom) were not actually accessible .