It’s a good experience for some of the prospects and younger players in Major League camp on non-roster invites, as they get to face competition at a higher level than what they’ve played against previously.
They also get to see how Major League veterans go about their day-to-day to prepare for the season, which can be invaluable on it’s own.
There can be a downfall with it as well, depending on where you are on the depth chart and the position you play. The team you are with are going to prioritize the players that are either competing for a roster spot, or getting their regular starter ready for the season – so plate appearances may be hard to come by at times.