Tubs and showers can be difficult to get in and out of if you have a disability or any kind of health condition that limits your maneuverability. In that case one of the best things you can do for yourself is to get a step tub of some variety.
Now a standard tub should be fine if you have arthritis or something similar, but a walk in tub will make entrance and exit easier, and that alone that makes getting a premium walk-in shower installation a good decision to make.
Another reason to get one is the other things that come along with them, namely, seats and handrails and textured pads. Seats are simply easier to use for those seniors who have arthritis or are afraid they might slip and fall. Seats and textured pads are there to create an easier atmosphere in which to clean themselves, without the thought of slipping and falling.
Handrails are even more important, especially if the shower you own now has a glass door. Those doors are not meant to be used to hold a person’s weight. The handrails in walk in showers are. If safety is a concern you have, handrails, seats, and other anti-slip accessories are what you want in your home.