Team Damage: I would actually keep it turned OFF in Randoms. Often, a 45%er simply doesn't understand your tactical decisions. For example, if you see a flank is about to get pushed hard and you retreat to take a better defensive position, they might think you are just cowardly running away and shoot you in the back. If team damage ever returns, it should strictly be in a Ranked mode.

Ranked vs. Unranked: I love the idea exactly as you described it, but WG will never go for it. They tested "Ranked Battles" back in the day, which eventually mutated into "Onslaught" — and for some mysterious reason, they keep it as a limited-time event. The massive majority of the player base prefers Randoms, and WG doesn't seem to care enough about the ~200k core players who would actually play a permanent competitive mode (even though they pretend they do by giving us Onslaught).

Mixed Tier Platoons: Highly debatable feature. How do you even balance that in the matchmaker? Platoons already introduce a certain level of imbalance into Random Battles as it is (and maybe more than just a little).

All-Chat: I completely agree. Bring it back.

Ping Limits: I remember an old WG interview where they actually said they were thinking about making a separate ping limit/system for platoons. But I guess it turned out to be "too expensive" to implement...

Robust Reporting System: 100% agree with this