From an outsider's perspective, it just looks hokey and inexact* to put down a mini and then do a full run-up. It hit home the most on holes like #5 and #11 and #13, or if the first shot hit something early and then the players gets to recover with a full run-up in the fairway.
Second, stand&deliver forces the players to demonstrate a separate skill --- that is, we've already seen them drive with a full run-up, and we see them putt, so let's also separate the fairway shot, instead of just repeating the driving skill.
These two things would make it more legitimate and compelling to the viewer.
And from a competition perspective, these long multi-shot holes would be so much more challenging with a forced S&D. Well, they'd be more challenging for people who can't S&D very well. So, you know, having more skills gains you an advantage --- just the way it should be.
*As players, we know that the player is SUPPOSED to be very exact (on LOP within 30cm), but we also know it doesn't happen sometimes.
**To avoid confusion: My definition of S&D allows a follow-through after release --- just no run-up allowed.