I love number-based comparison and the arbitrary arrows that are assigned when you win ranked games or lose them, they literally are so inaccurate, it can be anywhere from "one game to division uprank" to "on the precipice of division downrank". I know it causes Rank anxiety, so, just make it optional. Give us ELO numbers to hit. How kills affect ELO. In what ratio does our ELO increase depending on ratio of round win-loss. It helps massively for me, since I get anxiety seeing those random arrows, and I'd love to just have a number-based aim going into the game(I want to go up by 100 ELO tonight by winning 2 games in a row, for example).

By default, the option is off, but it can be turned on. You can only view your ELO and the ELO of your friends. You cannot view the ELO of the enemy team players(unless one of them is your friend, then you can only view that person's ELO). All this will bring into control, to some level, in-game tilt from descriptive ELOs, and people who just don't want to deal with it can turn it off totally (it will be off by default).

Edit: u/baruse suggested a totem pole-like system, where only arrow numbers are shown. It'll keep ELO as vague as possible, while giving some level of precision.