Costly Mistakes — Lessons from 20 Years of Building Products
TL;DR: Mistakes in product building fall into three categories: managerial (hiring "brilliant jerks", promoting specialists to managers), product (building without validation, CEO ego instead of user research) and technical (overengineering, cutting corners on refactors). Every mistake is a lesson — companies without mistakes "are going too slow". A debrief culture is essential.
Full article body is in Polish — an English translation is on the roadmap. The Polish version is available at https://bartoszgaca.pl/baza-wiedzy/procesy-i-zespoly/bledy-w-zespolach/.