As the mentee, it would be helpful to have the ability to view newest feedback first - vs scrolling all the way down.
Perhaps the ability to view the conversation in reverse chronological order - or a link to jump to the most recent.
Especially helpful for exercises with multiple iteration/reviews, and for ones a bit longer.
I’m not sure how universally helpful this would be - maybe I’m the only one thinking this! But also - maybe I’m not! 
I agree with this, either as a toggle or as the “normal”. My keyboard mappings (because changes a while ago) no longer make it a couple of key presses to get to the end of the conversation, and so I am needing to grab a mouse to manipulate the page in the browser every single time.
I have the benefit of having the conversation stored off web platform as well, though, so even though I have to do it every single time, I only have to do it one time per new message. I can read them easily over and over again as time goes on.