I've fallen back into the old habit of typing up long replies, then thinking "this probably isn't worth posting", "I don't have anything original to add", "this is all probably obvious to them anyway", etc., and Ctrl-A deleting it.

I've learnt intellectually that those aren't true as often as they seem they are, and I've trained myself to post things even when they don't match up to some made up measure of being "good enough", but some days none of that matters, just back to the base model my mind goes.