T99
3
While this limitation exists, I suggest that editors shouldn’t just copy the previous comment quietly. They should require the user to type in a new one or explicitly choose one of the recently used comments.
Btw, I do like that JOSM offers a set of recently used comments to choose from (if you remember to). Quite often you do a bunch of similar edits, then do some totally different edits, and then continue doing the same kind of edits you did before.