I think part of this also boils down to the DSCC's focus on promoting female candidates. I think that's a reasonable idea but something that leads to weaker candidates. Sometimes I wonder how John Fetterman would have done in 2016 against Toomey, as opposed to Katie McGinty.
Fetterman was a small town mayor running as an anti-establishment candidate. There was no way in hell DSCC would endorse him. What would really would have helped him would be a Sanders endorsement, which never came despite the fact that Fetterman actively sought it.
Now that he's LG, he should have a much easier time with establishment support. He and Wolf have a very good relationship.