I thought that it was to basically take away the ability to play marginal drawing hands, like smaller PP's and SC's profitably when you want to play TP type hands. Having SPR control from position allow us to decide what type of play style we are going to have or we will get out early. We can basically turn any hand into a 50BB style of play like the old Party days by making postflop become Push/fold or allow the game to play deeper stacked by making it tough to get the money in early while drawing to 6, 8 or 9 outs vs stations that we have no FE against on early streets. One thing I discovered as of late is attempting SPR control is almost useless OOP. Although the limp/RR with JJ+, AK type hands may allow us to limp more SC and such often enough against Laggy players that we can beat postflop.