It's actually a fascinating test of chemistry and discipline as the thing that might win you a championship - more so than talent, payroll or managerial decisions.
The exposure/contact tracing protocol seems like the biggest x-factor. Let's say a Phillies player tests positive the day after the first exhibition game, but the results aren't in until he's already played in the second one. Is every player who appeared in both games, from three teams total, now on 7-day quarantine?
They are really counting on the players not infecting each other both on and off the field, even more so than counting on them to maintain isolation (because really, they are not required to have their family at the same level of lockdown). And even just this week I've seen players fist-bump, and read about an accidental handshake, and they are still going to be taking meals together on the road, even if they are all supposed to be distanced.