> You not only stumble upon a weird bug in your hacky solution that takes engineering weeks to debug, but your interfaces are fragile so feature velocity drops (bugs reproduce and unless you address reproduction rate you end up fixing bugs only) and things are so tightly coupled that every two line change is now multi-week rewrite.

I don't think you fully grasp the issue you're discussing. Things don't happen in a vacuum, and your hypothetical "fragile interfaces" that you frame as being a problem are more often than not a lauded solution to quickly deliver a major feature.

The calling card of junior developers is looking at a project and complaining it's shit. Competent engineers understand tradeoffs and the importance of creating and managing technical debt.