Probably a controversial take - but in the pursuit of elegance. 'Uhh, so I need to hook this connector up to that receiver using this adapter and then uh, I pass it to the connector manager which sends it to the scheduler that... @#%! FML.' And then it's all so polymorphicized that going through the debugger you spend an eternity just trying to figure out what the types even mean and why/where they came from.

When you look at old-school code that just hacked things together, it was ugly, but also very easy to in turn further hack. There was no elegance or grand base types with 80 levels of inheritance to enable clean extension at every possible juncture of types. And no spending forever to find out the exact function you want to be able to override, only to discover that it's outside your modifiable codebase and wasn't marked virtual. Everything just worked.