Yeah there's no good reason for a limit. Having no character limit doesn't stop people from making short posts if they want. If they don't want long posts taking up half the page, then they should just hide the rest of the text behind a 'see more' prompt once it goes over 300 characters.
On a platform like Bluesky I can kinda understand if they limited replies to posts to 300 characters, so that people don't get walls of text in their inboxes but the original top post should be unlimited IMO.
Yeah, maybe we need a different word to describe the games and systems that we think of when we say "retro". Because when I think of 'retro' games, I'm thinking of Super Mario Bros and the OG Doom and shit like that, not Halo or whatever. I'm thinking of the time before consoles were mostly just pre-built PCs in a fancy looking box.