I agree with the author's general sentiment, but I would give Omarchy credit for some design features that I find either really innovative or well executed.
I find the launch menu the most interesting I've seen out of any desktop environment / OS. It puts easy access to your apps front and center and above esthetics, and yet it still looks great. It's not a sane request, but I'd love to be able to swap the launcher/start menu in another DE for a fully customizable version of that.
Omarchy also has a very smooth way to 'install' web apps. There exist packages that do that for you, but I've tested several and wouldn't recommend any of them. They're bloated (this should really only be a couple lines of bash, like Omarchy's [0]), some use web views (I really want an actual browser under the hood so I can have my extensions), and all that I've tested leave litter on your machine after removing apps or the software. I find web apps as .desktop files so useful that I'm actually using a hacky DIY script now (which I'm considering releasing under GPL if I ever find time to clean it up).
Also, whether you're a beginner or a pro, having a sane starting config for Hyprland is just convenient. Which tells you something about it imho. My conclusion would be similar to the OP's, if you're Omarchy-curious, try Cosmic on your distro of choice. Or at least a cleaned up version with the most egregious personal preferences (like a global keybind for opening Twitter/X) removed, if anybody cares to maintain that.
[0] https://github.com/basecamp/omarchy/blob/dev/bin/omarchy-web...