This is a photo of a roll in shower, which eliminates the need for having to negotiate any lips or bathtub walls. But it still requires transferring to a shower chair, and this one is extra wide. Grab bars also run the length of the shower.
Installing a roll in shower can be very expensive. This shower is part of a home that was constructed to be accessible. They also added pocket doors and widened hallways throughout. But expensive renovations are not possible for most people. And many homes can’t be renovated to be accessible.