I agree. But the strategies that Elm/React/Vue/etc use to deal with this can be copied without taking on all the rest of the baggage. Creating a Flux/Vuex-style

I agree. But the strategies that Elm/React/Vue/etc use to deal with this can be copied without taking on all the rest of the baggage. Creating a Flux/Vuex-style state container and a bunch of mutator functions isn't hard.