Yes the replace track thing is just plain stupid. Everything else in C10 super as far as my workflow goes, zero crashes and no problems on a stock, unmodified, new Win 10 installation with 20 cores. Red Bars? What's that?
I've totally lost interest in Studio 4 or even switching to Macs for Logic. But Reaper's in the upper righthand drawer just in case...
DaVinci Resolve still has a well featured and easy to use free version, but it's maybe 10 minutes per clip with the import/align/render/check steps. Doesn't seem to trash the video quality if you keep the same video codec, which takes some client interaction to get right and assumes sympathetic clients with time to spare. But it sure breaks the workflow when you're on a roll. Fortunately I mostly deliver stems.