This seems pretty cool for iOS/iPadOS, which sounded like a happy accident during development.
I'm struggling to see the point on macOS. From what I saw (unless I missed something) it just supports HTML, CSS, and Javascript... which can just run out of a normal folder in macOS, since it's all client side code. A local server is only really needed if you're looking to test server side code... or if you're looking to host a site for other clients on your local network.
That all being said, I have been disappointed by Apple removing the 1 click Apache server option. Here is the guide on how to enable it now. It looks like PHP has been deprecated. I know it's not what the cool kids are using these days, but PHP was always great for quick and dirty functionality without a lot of fuss.
https://discussions.apple.com/docs/DOC-250004361
