Quite frankly, there's nothing wrong for folks to ask for "correctness." Imagine if Lionel were to put "957," "567" or "2018" on the cabs of the NKP locomotives. Lionel would surely hear about it.
Even if Lionel were to offer the Legacy Berkshire in Illinois Central, Louisville & Nashville, or Santa Fe. For $500, I'd expect correct road numbers to be used per roadname.
Folks can always vote with their wallets and it appears that's what Casey's going to do.
Rusty