I agree that no desktop environment (DE) can account for everyone's ideal of what a DE should be. However, if you think about it, how many major DE user interface (UI) paradigms are really popular out there? Some like the way MacOS interacts with the user. Some like the way Windows interacts with the user. There might be some dinosaurs out there like me that liked the way the old X Windows system did things (think Solaris and Silicon Graphics from the '90s), but I don't think there's too many of us around.
How the DE interacts with the user directly affects the users workflow. Having a flexible DE that allows a reasonable measure of customization is a good thing especially if you want to standardize on one desktop. I don't think that having flexibility in this area is a bad because we all "grew up" learning different UIs and their conventions. It appears to me that if you like MacOS style, Gershwin is already to deliver. If you like Windows style, there are some customization you can do to Gershwin that Eric has mentioned that will mostly deliver that without making Gershwin as complicated to customize as say, the Trinity DE.
Now when it comes to OS level stuff, I agree with Charade. Take application installation on Linux as a great example. You have various package managers (.deb, .rpm, .pkg.tar.zst, etc) all of which are incompatible with each other. You also have systems like Flatpak, AppImage, and snap which are all incompatible with each other as well. I really don't believe that kind of system fragmentation is helpful at all. One of the things that I find appealing about BSD is it basically has pkg's and ports. And all of these more or less work across the different flavors of BSD (FreeBSD, OpenBSD, and netBSD).