Comment by ndriscoll

There are disadvantages. e.g. if you don't want to update a program (maybe the new version breaks your modded setup), too bad. Or if you need Windows still for compatibility, it no longer supports Windows 7, so you have to go hunting for old versions of the client and fiddle with it to prevent updates (if that still even works), at which point you'd might as well just mod it to remove the DRM instead.

Basically, it creates a failure point for setups that should otherwise last and be stable several more decades.