Could not agree more there. I've long considered the stand-up to be an inherently flawed concept. No matter how smooth you make the transitions or comfortable the restraints, the fact remains that human kneecaps just aren't meant to have 3-5 gs of force exerted directly onto them.
I think its pretty telling how THREE different manufacturers (Intamin, Togo, and lastly B&M) tried their hand at a standup model and none of them were able to gain wide appeal, or at least, wide enough to justify building more. Hasn't been one groundup standup in 20 years (and for good reason!). B&M still offers the model technically, but I highly doubt that we're going to see one within any time frame worth mentioning.
That having said, I feel as if the B&M standups could have been a lot more tolerable had they kept their designs relatively simple and not too big or fast. The Togo standups had an advantage in that regard, albeit less comfortable restraints, and worse transitions. I've heard decent things about Georgia Scorcher at least (the last B&M one to be built), which IMO is what they should have been going for all along.
There is enough novelty contained in the standing gimmick itself. There was never any need to ratchet these coasters up to 140-150 ft, with 5-6 inversions, as they did with Mantis, Chang/GL, Riddler. They essentially had built floorless coasters but with standup trains (yeah, I know the heartline is different, but you know what I mean).