[Bokanovsky]

I think when trying to categorise technical debt the Technical Debt Quadrant is a better tool [0]. It's already linked to in the parent article.

A lot of people are shoving all technical debt in the Deliberate / Prudent category. However I've seen a lot of code bases written by inexperienced developers and it would have be done completely differently if they had any experience (both of the inadvertent categories). This means actually updating the code base can be a complete pain. Sometimes you know if you're editing the code you risk creating huge regression issues and suddenly something that should have taken a short time can spiral out control if you want to add more functionality.

[0] https://martinfowler.com/bliki/TechnicalDebtQuadrant.html