Mainframes are very much impressive, I've worked with one before. They just operate very very differently from an "open computing" environment that we're all u

Mainframes are very much impressive, I've worked with one before. They just operate very very differently from an "open computing" environment that we're all used to. Once you rely on a mainframe the cost of continuing to operate it, while fairly large, is hilariously less expensive than moving all that code and data elsewhere. Especially given you will have to test all the code again and most people don't even know what it all does anymore, much less how to make sure it's doing it correctly.