I am a DM for two D&D 5e games. I always ask for character sheets when we first start out, so I can have a general sense of what I'm in for, and to get working on incorporating backstories.
Our friend group has gotten into the habit of sending out the complete updated character sheets whenever we level up. (We all play a lot, and I'm not the only person who DMs in this friend group.)
However, I don't really feel like I need all this information. Our groups are on the smaller side, so if anyone can't come, we cancel the game, so I don't need the sheets for playing absent characters. I don't want to micromanage monsters based on what abilities the party has; I want to create challenges and let them figure it out on their own.
So, my question is: What information from a character sheet is actually mechanically useful to a DM?
I would guess that I should keep a general eye on AC, hit points, and maybe passive perception, but is there more information I should keep handy? My general goal is to keep the game moving smoothly, with as little of asking players what they can do as possible-- but also without a ton of scanning through information that is useless to me on their character sheets.