I think people just seem to think that having a "floor general" point guard who is pass first is super critical. And it was a long time ago. Todays game has quite a few score first point guards starting for very very good teams. Ja morant is more of a scorer than a passer (good passer too though), Kyrie irving is more of a scorer than a passer (he averages 5.1 assists per game). Jamaal Murray averages 5.7 assists per game and is score first. Fox averages 6.1 assists per game is a score first guy. Clippers have terrance mann listed as starting point guard and averaging 2.1 assists though Im guessing that is due to injury. Reggie jackson is probably their normal point guard and averages 3.6 points per game.
I think sexton could average 5-7 assists per game if he got the minutes. NAW and THT as well.
Point being that many teams are successful without a true floor general pass first point guard.