> And they chose that path because it was cheaper than using the correct technologies from the outset

No, otherwise they would not need all those hacks. Web stack makes it cheap (fast and easy) to build an MVP, but since the very primitives required to fully implement requirements are not even there, they end up implementing tons of ugly hacks held by duck tape. All because they thought they could iterate fast and cheap.

It's the same story with teams picking any highly dynamic language for an MVP and then implementing half-baked typing on top of it when the project gets out of MVP stage. Otherwise the bug reproduction rate outpaces fixing rate.