You can build poorly architected apps and accrue tons of tech debt in any tool. Likewise you can build very clean, fast, extensible and powerful applications in things like PHP.

Don't pin this on ROR. I have seen absolutely atrocious Django codebases, Clojure projects, etc...

Types do not solve this problem either. If you think static types prevent 'tech debt' you're delusional.

Good architecture can be had across the entire spectrum of tools and frameworks.