Concur. It's only May 17. As long as he stays healthy, it's very likely he'll be up by the All-Star break or sooner for someone else's injury anyway. Or even as an easy swap if Matthews isn't stellar. When you consider that SWR is being demoted, it's incredibly rare to have only had 15 days of IL time from any of their starters at this point in the season. I checked one time and on average, we're at something like starter No. 8 by this time already.
At the most, service time is about No. 10 on the list of considerations.