Yes and no. For me, it boils down to this: certain starters are almost guaranteed (usually by needing too many pitches to record outs) to be followed by a succession of relievers, quite probably three of them even in a win. Whether your relievers are lights-out or not, they will be in the game. Probably you have a pretty good idea from the outset as to who they will be, based on availability due to bullpen usage in prior games. What is the best deployment of those arms? You go into the game hoping for a win (otherwise why are we discussing this?) and the only inning you know for sure who will be the first three batters, is the first, and those are usually good batters. Assigning a good arm to that inning, and taking your chances with the rest of the innings, seems like a modest improvement over hoping to find a high-leverage use for that one guy. So I don't see it as "sparing" that guy. You're just changing his entry into the game. People are assuming too high a standard for the choice of opener. It need not be your very best arm. Suppose in a traditional strategy you've got a small lead and your #5 starter falters mid-game, already at about 90 pitches, and walks the #8 and #9 batters, with nobody out and the top of the order now coming up, and you decide to bring in a reliever. It's too soon for your closer, or even your #1 setup guy. Who would you pick, subject to availability, as the guy with the best chance to put out this fire? That's the guy you probably want as the opener. (If you're a revolutionary thinker and would bring in your setup guy or closer so early, I'm fine with that logic too. And if your bullpen is so bad that you might leave the faltering starter in, then ugh, yeah, maybe you shouldn't try the opener strategy, but as manager you also should probably rent and not buy a house.) Of course no plan of battle survives first contact with the enemy. You have to have a Plan B for this, just like you have a Plan B for a traditional arrangement.