I think they are lucky to be playing the Braves in a short series and he won't manage exactly this way in the longer ones/against other line-ups. But it's hard to argue with the numbers versus just saying "let the starter stay in," and it also means we're unlikely to see Sanchez unless it is in a really targeted spot too (and Soto didn't get the nod last night since he's basically a LOOGY in a three-batter world). Should they need to do this again in Game 4 I'd consider an opener.
Phillies left-hander Ranger Suárez started Game 1, but he did not last long by design. The Braves had an MLB-best .871 OPS against lefties this season, the seventh-highest OPS by any team against southpaws since 1974.
(And Ranger allowed a .775 opposing OPS to RHB this season vs. .515 to LHB. He was coming out soon anyway, the baserunner just hastened it. Lucky for Hoffman he didn't get the guy he was supposed to get but then got the next one.)
And then there's also this. Another reason for Nola to be on a shorter leash potentially too, though they can't burn out the bullpen in Game 3 with no off-day unless it's the killing blow.
But the Phillies believed they had something to neutralize the Braves’ lineup: high velocity from their bullpen. Philadelphia's relievers averaged an MLB-best 96.3 mph on their fastballs this season. (They averaged 97.0 mph in Game 1.) Atlanta had a .509 slugging percentage on pitches slower than 97 mph this season, but it slugged a mere .396 against pitches 97 mph or harder.