> So why did they even change the major version in the first place? Note that minor versions of Qt are (modulo the occasional bug) API and forward-ABI compatib

> So why did they even change the major version in the first place? Note that minor versions of Qt are (modulo the occasional bug) API and forward-ABI compatible - an app built against Qt 5.x should still work without being rebuilt when updating dlls to Qt 5.15 This obviously won't work for Qt 6 - there are some API changes, deprecated / removed stuff, in Qt 6 we have `template<typename T> using QVector = QList<T>;`...