The downside is annoying a significant part of Varg owners that will not finally have access to TC (unless they fork out another grand).
TC was featured in Stark communications since launch (like adjustable virtual flywheel), it's been promoted for 3-4 years now without ever specifying it would be reserved to alpha owners (in effect it means it's hidden behind a $1000 paywall for 60 hp owners).
Stark do have a unique way of improving their bike while simultaneously pissing off a good portion of their customers with stupid marketing strategies. Pro subscription 2.0.