OK, so VST3 is a new improved (and still improving?) plug-in specification.
For VST3 to be of any benefit to users:
(a) the DAW host must support its functionality,
(b) the plug-ins must make use of that functionality.
So my questions are:
Q1: what aspects of the VST3 new / changed functionality does Reaper support?
Q2: what aspects of the VST3 new / changed functionality does the (<insert name here> plug-in implement?
After all, a developer could take a VST2 plug-in, build it into the VST3 format, without adding any support for the new /changed functions, but it would still be a VST3 plug-in.
Or, have I missed the point?
I'll get the pop-corn and pitchforks!