I think there's some rationality. Let's say as a company you need money. Money comes from investors and/or customers. Customers or (especially) investors may w

I think there's some rationality. Let's say as a company you need money. Money comes from investors and/or customers. Customers or (especially) investors may want you to make "modern" software using "modern" technology. Developers (especially the young talented ones you can afford) are also attracted to modern tech for rational ($£€) reasons. So you can ignore that, and miss out on money and talent and thus maybe success. Or you can take the easier route and do what everyone else is doing.