@gotofritz: So, your intent is to make WP no longer allow acronym and strike in the Post editor? If so, well okay…

Not sure, but in either case, that’s not a move I would force on others. Developers/editors should know enough to not use now-defunct elements, but if they don’t, that’s their business, as far as I’m concerned… Perhaps a friendlier approach would be to convert those deprecated tags to their modern counterparts, messaging the editor post-save?

If I missed interpreted your point, sorry.