First vs Second winrate in Bo1 is a serious, serious problem.
Basically, title. The last figure I saw from tappedout.gg was something like 43% to 57% - but that was a few years ago, and it feels like it's gotten worse since then (with how much power creep there has been).
Some people offer the counter argument "just play Bo3" - which may or may not be a fair point (it does balance out the winrate, but it's not as casual-friendly as Bo1) - but that counter argument doesn't really hold water when Brawl is a gamemode, and Brawl only has best of 1.
While Bo1 is a largely played game mode on MTGA, and while there are modes like Brawl where it's the only offering, something must be done to balance Bo1's winrate. I know there's no money to be made in improving the game just for the player's to have a better time, but come on, for once in recent history do something that isn't just about money.