not very important
When someone reads your message, it should tell you in someway that they read it. Basically like Instagram with their profile picture showing up below your message to see that they read it, or it can just say “Read”.
I also think we should be notified when someone puts a reaction to your message in DMs/channels. There’s people that don’t reply to your message with a “okay”, just react with a heart or a thumbs up.
Again, this is not important at all and shouldn’t be prioritized but it’s a nice QOL change