Accessible bathrooms aren't only for people in wheelchairs, they are for anyone who has mobility issues...back problems, sore knees, balance problems, or a variety of issues that make climbing in and out of a standard tub or shower difficult, and, they don't need to look institutional!
A renovation is an ideal time to prepare for "the golden years", when simple tasks become more challenging. Extra blocking in walls for future grab-bars, comfort-height toilets, and better lighting will all be helpful in future years, and make it easier to "age in place" safely and comfortably.