[KolmogorovComp]

And the migrations. Or rather all the half-started migrations that never get through meaning you have to deal with api v1,2,3 all the times.

Those are pervasive in any old and large project but in my experience especially so in compilers.

[sieve]

Management problem more than anything else, I feel.

Compilers should not have so much churn. You decide on a set of language features, stick to it and implement. After that, it should only be bugfixes for the foreseeable future till someone can make a solid case for that shiny new feature.

Scope creep is bane of most projects.