I play in diamond and its swayed from 222 to more 312 and i also see 4-5 DPS alot more often as the seasons go by. Also alot of unnessarry switching between roles that effects the overall comp negatively.
We will see. I can think of many potential improvements.
it gives much needed structure to competitive
role based SR makes games more balanced/competitive and gives incentives to play other roles without hindering overall rank.
less random/coinflip games
means u can play whoever u want without worry of hindering overall team comp much
easier balancing/buffing. Especially for tanks/support without worry of stacked comps forming
easier hero design due to not being able to stack
no solo tanking or healing for multi dps
tanks are guaranteed a 2nd tank and 2 supports to enable them to make space for team more effectively
supports are guarenteed 2 tanks to play around and have more chance of being protected when having a hard time (rarely any1 peels in multi dps comps.
not switching between roles encourage people to realise that counter picking within roles is possible and can be effective. Switching between roles can often be detrimental.
higher chance of team oriented gameplay imo