That is very true but absolutely fine because then some fine set of engineers can do the hard lifting parts and rest of the ecosystem can thrive on stable base

That is very true but absolutely fine because then some fine set of engineers can do the hard lifting parts and rest of the ecosystem can thrive on stable base that core establishes. That is how things work in most of industries, not everybody is writing a compiler (or even suitable for writing one!), but the complexity compilers remove lets you build more complex pieces of engineering.