With Cohost's inline CSS feature you can actually make the smallest posts if you really want.
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in reply to @erica's post:
actually i need to find out what font cohost uses, or if it pulls from my browser's settings
because i was pleasantly surprised by how well i could read that tiny text without leaning in, and there's only one font i know that lets me read it that easily and that one is Atkinson Hyperlegible