I'd consider it just an opinionated distribution of Arch, with a lot of flex.
Sure, I think if you disagree with the majority, you'd go Arch and rice your own from the base install (lot of folks who do), but if not, it's a very streamlined way to get off to the races with a community supporting the shared baseline 'opinions'
But Omarchy is a fully pre-configured distro, there's no flex in that.