I want water available during my home birth for two reasons:
1) in case I need it for pain management. I won't know if I'll feel loads better in the tub until I try it.
2) I see all these videos of women squatting and holding on to chairs or being supported squatting by a partner and that just doesn't look comfortable to me, especially when I see the videos of some poor mamas being dangled from hands gripping around their armpits (seriously, ouch!). If I really feel a big urge to squat for longish periods of time (and I felt a huge urge to get up and do squats/shimmies with my first when I was stuck in the hospital bed before the epidural), I want a weightless, effortless squatting sensation rather than the dangling/struggling to hold my weight on my pregnancy cankles through contractions one.
I might never use it, but that's okay. Better to have it and not need it, imo.
ETA: just realized I didn't actually address the post. I want the water there for practical purposes, but the idea of giving birth in water doesn't really appeal to me. I'm a huge bath person and I stick my nose up every time someone calls it "washing in your own filth", but I've seen just how much blood, poop, and sick I'd be floating in if I did the whole thing in the water and... urgh. If it helps me, I'll put up with it, but I'm not one to think about being in the water as an ephemeral experience I don't want to miss out on.