Yes, possession takes longer to develop in players than direct. This does not mean that direct players don't add value to a primarly posession team.
From the article I provided a link to...
Committee members, who met in Indianapolis this week, recommended that no reentry be allowed in either half once a player leaves the game via substitution in Division I men's soccer. Additionally, teams will have six moments to make substitutions in a game, and substitutions can occur during any stoppage of play. Teams would be awarded an additional moment to make substitutions in overtime.
In all three levels of men's and women's soccer, the committee recommended that the clock would stop on all substitutions in the last 15 minutes of the second half and in overtime periods.
Committee members discussed the substitutions options thoroughly and wanted to discourage using substitutions as a tactic to slow the pace of the game.
"This aligns with the sport that our incoming student-athletes are used to," said Tim Cupello, men's soccer coach at UC Riverside and chair of the rules committee. "It also aligns with the sport they would be playing if they are fortunate to continue playing after college into a professional career. The game model and coaching style will reflect what they had during their youth development."