From The Athletic’s Ken Rosenthal:

Bob says this move comes as a bit of a surprise.

Going back through the season, the Phils’ young starters took a step forward and kept the team afloat for much of the year, with those suppressed flaws finally surfacing in September when the squad collapsed.

In 2018, the Phillies were 6th in starter FIP, 7th in starter WAR, and 15th in ERA. That’s up from the year before, when they were 22nd in FIP, 21st in WAR, and 21st in ERA.

I don’t know a ton about Chris Young, but it’s interesting that Rosenthal says other teams had interest in him.