The fillets is not a super huge deal, but the inability to edit referenced geometry without breaking later features for me was the deal breaker with fc 18. I think for 2d drawings that is a non issue, but once you venture off to 3D and start projecting geometry, that is when things used to get ugly with fc18.
If that was fixed in fc19 I definitely will be trying it this weekend when I have time. When I last looked about a year ago… the dev team was putting a lot of energy into getting named geometry working to fix this… but they also said it would be fixed in 0.18 and it wasn’t. So maybe it is/was a hard thing to fix, which makes me skeptical 0.19 fixed it tbh.