It's actually kind of fascinating, do they just see innings as innings in spring training period, regardless of player, situation and role, or is that also reflective of the fact that the Phillies bullpen is run with that kind of flexibility when the games count too?
More likely the former: Craig Kimbrel, for instance, had 0 save opportunities for the Orioles this year, and 0 save opportunies for the Phillies last year, and he's a guy who did actually want to prepare for that specific role. Alvarado had zero save opportunities last year, 1 this year (which I assume he blew but he did have two holds).
As SF loves to remind us it's not a bad bet to expect great things from the worst or most lightly used relievers the next season, which would be good news for Seranthony, Soto and Alvarado, and perhaps not for Hoffman and Strahm. But it was a great bullpen last year and it's still a great bullpen on paper now. The Kerkering and Walker IL stints set it back a little in the short-term because Kerkering is essentially replacing Kimbrel, even if he's lower in the pecking order.