Never had one.
Managed not to drown either of my kids. (thus far)
it might make things easier, but it's certainly not nessesary.
I always found the very best place to bathe my kids as babies was the kitchen sink.
We have kinda old fashioned square deep sinks, too small for baby to slip down into a horizontal position, but nice and deep.
Also added bonus of being at a confortable height, and having plenty of surrounding bench-space for all the stuff, and to lie babba on and dress them afterwards.
No carrying water too and fro and messing about.
I had a baby bath on a stand thing, but it was awkward to move, especially with water in it, and awkward to fill - it did have a handy tube thing to let the water out, but that was only useful if you had it set up near a drain.
The baby bath was long enough when they were very small, but pretty shallow.
I hardly ever used it with my first, and only once with my second.