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@byllgrim@mastodon.xyz When you know they'll be needed, and you know they'll be more costly to do later. Maybe they're not "premature" in those cases, but I've seen a lot of time wasted refactoring things that would have taken much less time initially.
@byllgrim@mastodon.xyz There's a lot of XP/Uncle Bob's "wisdom" thrown about that seems to imply, "Don't think, do!". #YMMV