Part of the problem with a directory of forkable themes like Hugo has is the security risk that comes from untrusted code. The Go templating language is pretty simple and easy to sandbox, but MKWS uses sh as the templating language so there's a lot more risk.
That was pre-LLM, now I think prompting your website is going to take over. Same for all software, you'll have to compile everything yourself because you'll be modifying everything yourself (via llm).
Author here, it's simple to use if you're building simple stuff, it's complicated to use if you're building complicated stuff. Cool thing is, it gives you the flexibility to build complicated things without getting in your way.
my 2 cents are that the problem with static websites IMHO is not to generate some HTML but to have some inspirational templates
hugo has a ton of cool templates one can fork quickly and adjust