X Rounds of Combat

There has been an undeniable feedback loop between tabletop role-playing games and video games for a long while now. Tabletop games have been adapted to video games medium and some changes in gameplay, some mechanics have found their way back to tabletop games. And I don't always like it. My problem lies with D&D 5e specifically. It's probably not even the way the game is written or intended to be played. But in my experience the younger players tend to approach the game as if it was an MMO - a sentiment clearly started in 4E. In 4E each class got assigned a role in the party (Defender, Striker, Leader, Controller). There is no such thing in 5E explicitly but there is the myth of a balanced game, balanced encounter, balanced party.  It reminds me of early Fallout games where Fallout and Fallout 2 where extremely focused on role-playing to the point where you could avoid combat almost completely but Fallout: Tactics was completely focused on team combat. Older editions of D&