I remember when apple fans used to say "oh, specs and benchmarks don't matter!" Wish they could hold to that here too- these machines are not meant to be used by almost anyone here. The base machine is a little low-specced, but it's a great fit for some music production where you don't need a crazy high CPU speed but you need all the expandability. The iMac pro has expandability over thunderbolt, but that's it; each of those crummy adapters introduces another vector for failure, especially when dealing with audio production.
the iPhone 11 and iPhone 11 Pro both get the same results, and nobody here is saying "pssh, apple shouldn't have the more expensive phone for sale". Variety is good. It's good to see Apple at least make an effort for the professional audience that isn't just developer and enthusiasts. Apple will of course sell you whatever you are willing to pay for, but the iMac Pro is really the best Mac for almost everyone at this point.