As "just a guy that programs" (ok, now guides agents to program) and tries to follow the rules (with a big dose of pragmatism), this totally makes sense to me. This is also the first time I've seen or heard about this coming.

I like that we now have a way to not being forced to define Resources when we want to query. It always felt like I was missing something that there could be an infinite, defined-on-the-fly number of Resources for a "part" of a given Resource. Do I really want to define "all cats that sleep more than 20 hours a day and like sunbeams and want to eat breakfast at 3 am" as a Resource? (ok, we all know that is actually the full set of cats). I'm ok that you want to define that as a Resource but in my system, it makes more sense that Cats is the Resource and I just need some accepted way to query.

I like the implementation (again, as just a guy that programs). I don't see how it could have done it better or simpler which probably hides the complexity of getting there.

I also especially appreciate how the spec is written. Opening a spec, I wonder how far I'll get before I don't know what the heck they're talking about (and, again, as just a guy that programs). I don't think it's easy to write a spec that is complete and approachable like this. Really appreciate that.

The standards have always been a bit more abstract than you use in practice. Common practice prior to this would be /catsearch?sleep=20&sunbeams=yes&breakfast=0300 where the "resource" is /catsearch and the rest are query parameters, but you could also use /catsearch/sleep/20/sunbeams/yes/breakfast/0300 which looks like a "resource", but nobody is actually enforcing that it is a "resource".