I'll save you the hassle and tell you why they don't like sharing information.
- They don't want people figuring out their MMR, as that leads to people deciding when to throw and when to actually tryhard.
- They're ashamed of their secret sauce SBMM algorithm and would prefer to keep it as a black box so people can't criticize it as easily.
- They don't want people to figure out they're using EOMM, as a subtype of SBMM. Just because you didn't copy Blizzard's patent, doesn't mean you didn't have convergent evolution with your do-it-live spitballed code, and can't claim it's not EOMM. Being slick calling it not EOMM as if it's some copyrighted term only Blizzard can use ain't it.
Gentle reminder to employees that matching newbies struggling with a hard carry duo once every 20 games on a variable reinforcement schedule is EOMM. I'm trash myself and can tell when it's my turn being carried to a win, like most of my wins. They have very lax SBMM matching constraints and don't seem to adequately enforce MMR bracketed lobbies. They just seem to use SBMM to escort people to a win on a minimum threshold for EOMM purposes, whether intentional or not.
Also to any employee reading this: I'd rather uncheck "fill teammates" and go solo into Duos and never get a win than to get thrown into a lobby I don't belong in and get yelled at by a hard carry stack. Balancing on paper for that 5% winrate metric can result in inferior player experiences, as people who are trash like me basically have to do degenerate gameplay just to survive in too hard lobbies while getting cursed at.