the game went from 5 roles to 2

There are actually only 3 ways the game is played, maybe 4.

1 - pro play 2 - team play 3 - solo play 4 - casual

The biggest reason you don't see other styles of play, which is maybe 90% of the community base, is because you only see half of the way the game is played.

Every complaint on the forum will be players from 3 and 4, and they will most likely never see team play in their entire lives because. . . they don't reach out to make teams etc. Or they do make a team.. only to fail, wipe, people quit.

Kind of like in MMORPG's you see the team with most healers win. In MOBA's the general rock paper scissors is whoever's ADC is better wins.

The last time I was big with creating teams for RANKED 5v5 I had to step down as mid laner, to play ADC because I could never find anyone capable of playing ADC correctly.

Anyways; TLDR, make a team and try new things. Don't be a meta whore and "copy" pro's when it's obviously not gonna work and a majority of your solo games will be up to luck. (MATCHMAKING WILL NEVER BE PERFECT)