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OP is expecting the deletion of posts and comments to federate in the same ways posting them would. I don’t think they’re necessarily going scorched earth and care about someone quoting their comment in a reply or resharing a photo.
I think that’s a bit grandiose of a stance. If I misread what someone said or realized someone already said what I did I don’t think deleting it leads to any kind of growth.
That’s setting aside how draining it can be to reply to several people who are making the same argument about how you are wrong. If I couldn’t delete what I posted at that point I would just be creating a slew of edits to justify myself like people regularly do on Reddit whenever they get downvoted.
It reminds me a bit of Garmin acquiring Pebble and discontinuing support. This does sound significantly worse though