I can think of one thing you would want laying around, limited count abilities, like transfer glyph bearer scrolls, transform into bat scrolls, and traps.
Other than that and the already dropable enchants, yea, nothing really needs to stick around.
Yeah I don't mind them lying around as they can stack so when I pick them up, I know they go into a slot alreayd made, not in a new one. So really, finders, keepers.
Also, I have noticed a few of the features are outdated in new mechanics, which is fine as most of them get polished and brought into the "New Age" with the rest of the features eventually. So I just like noting when I feel that an old feature is no longer needed (and with the absorbing enchants implemented, it felt like the only thing missing was the poofing of spells.
But I do sometimes feel guilty about advising people on how things should work in a game they are making, but then again, with AVWW, it feels like a lot of the game is community-driven in a way, as long as it does not affect your main ideas.