How is having to use “amp” attributes and loading a script from ampproject dot org simpler than just not doing that and everything works with every browser and

How is having to use “amp” attributes and loading a script from ampproject dot org simpler than just not doing that and everything works with every browser and without JavaScript and you don’t have any dependencies on Google servers? AMP as a subset of existing HTML is fine, but at that point it’s just a style guide. AMP as the existing invasive species it is just adds more complexity to an already complex web “ecosystem.” Google did not invent or even perfect maintainable web pages so why should I have to “grab” anything from them on the supposedly decentralized web?