Then perhaps, in true open source fashion, you can put your time where your opinions are and either start another project or help the wordpress team to correct what you think is bad.
Changing WP to use more modern design patterns (whatever that would entail) probably means breaking all themes and plugins, which isn't acceptable (and even if that wasn't an issue, I doubt the WP maintainers would just accept a PR that completely rewrites everything). This isn't really a thing random contributors can help with.
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Then perhaps, in true open source fashion, you can put your time where your opinions are and either start another project or help the wordpress team to correct what you think is bad.
There are already lots of CMSes out there.
Changing WP to use more modern design patterns (whatever that would entail) probably means breaking all themes and plugins, which isn't acceptable (and even if that wasn't an issue, I doubt the WP maintainers would just accept a PR that completely rewrites everything). This isn't really a thing random contributors can help with.
In the sense that (IMO) most people don’t need Wordpress, I am, I am (slowly) working on (yes another) static site generator.
But, in response to your general theory: I can criticise a car as being fucking terrible without someone suggesting I “go build my own then”.