You dont want to put all your eggs in the same basket, not in this age when a framework can become obsolete in just two years. It only make sense if you already

You dont want to put all your eggs in the same basket, not in this age when a framework can become obsolete in just two years. It only make sense if you already have a small team - you want to use what they know best. But if you are growing you can have many small teams. You will also exhaust the talent supply if you lock yourself down to only one platform/language/framework.