tmux and screen make it comfortable to manage multiple sessions. That's why I don't just use dtach. Having one session with multiple buffers/windows is easier to manage than one file for each dtach'ed program. Basically, I'd have to script my way out of dtach's bare bones session management feature set.

I don't really use tmux's or screen's split functionality, and if I did I'd probably start using http://www.brain-dump.org/projects/dvtm/. Hmm, abduco seems like dtach on stereoids and is thankfully separate from dvtm and required for detaching dvtwm sessions. Maybe I should give that a try.

I would recommend abduco+dvtm. That's where I've ended up. Then again, I'm biased in favor of suckless-brand things.

I also somehow configured abduco to always start a dvtm instance inside it, so there's no pain from it being two separate programs.