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Counter anecdote: all of the hardcore Nix users/developers convinced me it was worth it to switch to Flakes now. They even helped me move my NixOS config as well.

It sounds like a python 2 vs python 3 kind of deal, which intuitively makes me think that you should just use flakes

I'm a relative newcomer too— started about two years ago with a Flake-only workflow on Nix 2.3. My sense in observing the debate over this time is that about 20% of the objections are technical in nature, while 80% are around governance— feeling that the feature was smuggled into the main repo as a prototype, despite there being existing external projects (niv) that were trying to accomplish a lot of the same things.