While I agree with this project being a bad idea, both 1 and 2 are addressed by HTMX itself, via hx-preserve and Out-Of-Bounds swaps.
re: hx-preserve. what if i want to "conditionally preserve" - preserve this element when my state is one way, but not in other states? i dont see a way.
re: hx-swap-oob. looking at https://htmx.org/attributes/hx-swap-oob/ i think it still does not address what i'm looking for. any master-detail list kind of UI will want updates in 2-3 places when 1 piece of state updates (aka ui consistency, ui as a function of state). i fail to see how attaching an attribute with 1 place for an ID solves that. perhaps theres another api for "multiswap"? even if it existed... idk if i'd be comfortable using it man (ofc, i am clearly biased/taught to "think in components" from 7 years of react exp)
You could send the state back to the server with the request and respond appropriately on the backend. Or check in the db without sending it, if it lives in the db (it probably should?).