IMHO it's because so many people take decisions in rush. e.g. let's not design database, put whatever data shape we came ip in alpha version and see where it go

IMHO it's because so many people take decisions in rush. e.g. let's not design database, put whatever data shape we came ip in alpha version and see where it goes. Sometimes people favor one particular technology because every other startup chose it. To be quite honest today's software engineering sadly is mostly about addressing 'how complex can we go' rather than 'what problem are we trying to solve'.