For the same reason most homes have a combined shower and bathtub - efficiency and space management.
efficiency and space management.
it really ends up being limitations on room size, plumbing is nothing you can just tie into toilet... i'm not sure if you go into sink drain or not.
if you look at higher end homes, a lot do have them.
and think of all the water saved too, i'm really shocked they are not used more often in residential
ProTip: the shower is also very handy as a urinal
Bathtubs are gross, why do people like to bath in their own piss/shit mixed water?
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