Rainbow Six Siege needs more game modes, not unranked and ranked or quick match but something like Team Deathmatch permanently. It worked really well when it was here for the Halloween event and I'm not sure why they get rid of those modes.

You could even go a step further and add the attack and defend mode that existed in Rainbow Six Vegas (Calypso Casino), with lives. One team defends the package and the other has to extract it. I'm not on PC so I don't get to participate in any test server activities but please add a permanent game mode with lives. I love the original mode but after 6 years of it I'm dying for something new.