Well, I’m not a professor, but I am a musician, LOL.
Perhaps “the dilettanti” insisted upon a full encore because it IS GOOD. :-)
I guess I’ll never line up with “Music Critics” though, as they hated the premieres of “Carmen” and “La Traviata”, my two favorite operas.
(((Of course, the premiere of “La Traviata” featured a 300 pound soprano who was supposedly dying from consumption, which may have stretched the audience’s patience a bit. )))
You won't get any argument from me there. 49 years ago I played hookey from high school to see the Philadelphia Orchestra under Eugene Ormandy perform Brahms' Violin Concerto and Beethoven's 7th. I still think they are the best concerto and symphony ever, with Bruch's concerto and Brahms' 4th both getting the silver medal.
Splitting the difference between the Allegretto and the Scherzo is, as I put it in my class when discussing the best tempo for Mozart's 40th, like two chefs debating over the amount of tarragon to put in the au jus for the lamb roast, while everyone else is doing drive-bys for chicken nuggets.