Thread collapse on the right, increase text size (seriously why is it so tiny?), remove pointless numbers on the left side of homepage, remove BS sponsored YC job postings, take better advantage of horizontal real estate on desktop, make everything easier to click on mobile (I have to zoom to hit stuff all the time).
This site is fine, and I use the regular version on desktop and mobile, but let's not deceive ourselves into thinking it's perfect.
You know you can increase and decrease views in modern browsers right? On chrome for mac, use command minus for decrease and command equals for increase. I run my browsers at 110%