I think a lot of us have a philosophical difference here in our interpretation of the idea of racing. (Whew!)
I think that over the years a difference developed between short circuit and TT/Manx racing.
Particularly in the MGP, a lot of people consider that their racing is very much a solo effort, with them racing against themselves (to better their time/skill) and against the course itself.
So, if you have a relatively slow bike, you can still perform well by getting the most possible out of it. This can be done without reference to anyone else in the race.
Perhaps an element of that had also developed in the TT, and maybe (just maybe!) it was inappropriate, (given the speeds of top bikes/riders) or perhaps it defined the inherent difference between the Manx and the TT.
Short circuit racing (massed starts etc), and the "new" TT are very much about racing each other.
BUT both are challenges and races...
Have I got a point???