Couldn't disagree more
First off - Dumbo was never an E-Ticket - it is a C.
E-Ticket is a simple measure of quality, scope, scale,detail, cost, and in turn end up being the most popular attractions. They obviously still use the term internally as do some of the fans when discussing quality, scope, scale, etc.
It is not as subjective as you claim.
If you can't tell the difference between attractions like Pirates, Mansion, Country Bears, Original Imagination, Tiki Room, IASW, American Adventure, Splash, Horizons, SSE,TOT etc and newer attractions like - Mermaid, TSMM, Soarin', ect then I can see why you believe what you wrote. But some DO see the difference.
And it is true - WDW haven't built a true E-Ticket since TOT (or Everest if they could get it up to show quality). Either way - that is an extremely long time for a company that once prided itself on building such attractions...