Outside of the SV bubble, it's not common for companies to migrate working systems to something new unless the benefits clearly outweigh the costs, and there's nothing better on which those those costs could be spent.
There are a number of stories online, in HN, and in the business press where companies "upgraded" from legacy systems to something "saner" and it ended up costing more time, money, and customers than it was worth.
Outside of the SV bubble, it's not common for companies to migrate working systems to something new unless the benefits clearly outweigh the costs, and there's nothing better on which those those costs could be spent.
There are a number of stories online, in HN, and in the business press where companies "upgraded" from legacy systems to something "saner" and it ended up costing more time, money, and customers than it was worth.