I agree & let's see.
I do think that the Marzipan apps should've been optional downloads to the OS from the Mac App Store for all of the reasons that you state.
I'll be happy if by this March, we see versions that feel closer to the Mac App Store.
On the other hand, you can just put them in a folder in Launchpad and forget about them as none are really essential!
In another post, I said that this release feels very much like Snow Leopard and I definitely stand by that. Of course Snow Leopard didn't launch with the Mac App Store, but ended up with it near the end of its active development.
I'm wondering if we'll see similar changes to Mojave as we get ready for what will be quite a significant change in 2019 to macOS.