Slow mode in group chats

When the chat gets very busy/fast, it can be hard to keep up for some people and you can't even heart a message in time before it vanishes. This has been a problem since I joined here many years ago now.

So why can't a 'slow mode' be implemented? When a number of messages are sent within a space of time, slow mode is triggered and people have to wait 30 seconds between each message and you could maybe trigger it for 15 minutes or so. Or mods could turn it on or off if they feel it's getting too fast or members mention the speed of the chat.

This is a function on other websites. It's used on Discord, so I'm surprised it's not being used here. It might even help people actually pay attention to messages more and think about what they want to say before they post.