I have kept a bath in the bathroom in my flat (with shower above it), and a shower in the en-suite. I know many of the flats here have changed to having just a shower in both rooms. But, there are times when still want the luxury of relaxing in a bath.
My eldest grand=daughter (aged 22 yrs), rents a lovely flat with her boy-friend right in the centre of the city in which they live. However, this has just a shower, and top of her wish list is for them to find somewhere different where she can have a bath (and a cat).
When she visits her Mum back home, she always uses the opportunity of having a long bath in the P-shaped bath she remembers from her childhood. My daughter, (her Mum), never uses the bath, only the shower. Another adult granddaughter has to ensure anywhere she rents has a proper bath as she needs to this at least once a week for her skin condition.
When I had a new bath in the bathroom, I purchased some sticky shapes that I put in the bath at the shower & tap end, which hardly can be seen, but make that area completely non slippy. Have a grab handle on the wall by the shower and a very firm screw on grab rail to get and out of the bath. It is very safe.