Most multisignature behaviors still aren't exposed, its kind of weird. But looking for to taproot making multisignature addresses indistinguishable from other addresses.
There's the general empty space that people shove all sorts of things into. From plain text metadata to encoded messages to derivatives trades.
Even vitalik has mentioned that this attitude was one of the things that turned him away from bitcoin (along with refusal to evolve features) and launch ethereum.
In the mean time, a lot of people still tinker at their own volition, read technical books, or now learn about blockchain structures in universities, leading to a continual new set of people using blockchains differently or at their fundamental level.
The what now?