I frankly have no idea if you have a point or if so what it is..
The point is... you're throwing out (your) opinion as fact.
No VST3 support for the Motif is a "deal breaker" or "non starter"
As a fellow Motif XS owner... I'm here to tell you that isn't so. It's pretty easy to work around the issue.
Instead of asking Cakewalk why they don't support VST3, ask Yamaha why they re-invented the wheel.
Why change a standard that didn't need changed? It was simply to give themselves a competitive edge.
To stiff-arm end users into using their products...
BTW, I've owned every flagship keyboard workstation from every manufacturer... and calling the Motif XS/XF "the most popular workstation by far" is a little bit of a stretch. Again, it's opinion expressed as fact.
The M3 didn't predate the XS by a significant amount of time.
There are no magical features in the Motif VSTi editor that couldn't have been implemented using the VST2.4 standard. Your frustration/disappointment is focused on the wrong group.