Why do all those micro framework copy the worst aspects of flask? The global request object, the bad integration with sqlalchemy, the strong coupling with an a

Why do all those micro framework copy the worst aspects of flask? The global request object, the bad integration with sqlalchemy, the strong coupling with an application object that forced the indirection of blueprints... If you start again from scratch, forcing people to migrate their stack and therefor leave their ecosystem behind, at least fix the glaring API problems.