Another yada yada yada from Respawn to people who on the other hand have too low IQ to understand that this is smoke and mirrors + how the game should be played.
Only point that makes sense is nr.2 - which is what most people don't get = teamwork can increase your competitive level even by a tier, sometimes maybe even more. Those no comms D4s can easily be D2+ if they use comms / have any interest in teamworking.
Most people play 3v3 BR as soloq queue and worse solo one man squad type of play = 20 bomb only for myself and flex at the end or I don't care to try mentality.