I can't stand instant coffee and have never had instant taters but couldn't disagree with you more--though I respect your right to your opinion wholeheartedly.
I nearly always have 'all the time in the world' when I cook so speed is not an issue for me. For me it's what works best--in my opinion--for the meat at hand. And for me those temps are too low for spares and waaay to low for backs. Imo, mass-produced pork not only does not need those temps but doesn't do as well at those temps as at higher ones. So--again, to me--there is definitely an alternative, and it is one that works better and, again, to me, the results prove it. For pastured pork, which is far more flavorful because it is far more fattier, I am in your camp. But for standard mass-produced pork I'm not. I often find that low/slow serves as beneficial for marketing, but not for cooking--not, anyway, for the lean pork and beef that is what most people know.
Again, my opinion. I'm not trying to ruffle feathers; just make my point. I know everyone has different tastes and approaches and I applaud that.