Good analysis from Nick Statt on the havoc that macOS Catalina causes:
For one, this update is the first for Apple to drop 32-bit application support, which is causing all sorts of headaches for users of smaller apps, plug-ins, and other software that may not be updated for quite some time or may have been created by a company that no longer exists. There are also a fair number of other issues with Catalina, like Adobe software incompatibility problems and unforeseen hurdles related to the removal of iTunes.
Should you upgrade? It depends.