I think this makes sense, to avoid noise, but the issue seems to be what happens with the forum poll. Proposals cannot pass to phase-3 without a majority forum poll support (this disagrees, but I assume it’s superseded by this). But the processes don’t seem to cover the case where proposals are edited after the forum poll closes with support.
Intuitively, it seems like edited proposals are new proposals from an approval standpoint. Therefore any edits after that time should occur in the same forum thread but a new poll should be created each time. But currently that’s not specified.
Of course the simplest and most robust (from a governance perspective) process is that edits can only be made during Phase 1. What passes to Phases 2 and 3 is then voted on without further edits. But I appreciate reality requires something more dynamic than that.