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Just tried this on Linux with 2 of my existing projects. All I had to do was enable the feature and run with dx serve --hot-patch and all systems would hot-patch. Great stuff!

Little update: https://github.com/TheBevyFlock/bevy_simple_subsecond_system now supports changing the signatures of systems at runtime. Would be nice if this PR did so too, but I'm also fine with leaving that for a follow-up :)

The future is now

Update again: I added an opt-in to rerun hot-patched systems to the prototype. This makes it way nicer to edit UIs live, as it means we can just rerun regular setup systems that are typically in OnEnter or Startup. Which breaks their run contracts, but I think that's fine as long as it's opt-in per function.
Not sure if we want to land that in the MVP, just pointing out that this possibility exists :)