[justin66]

In my experience mainframes at financial institutions are hidden behind IBM middleboxes that are specifically designed to obviate the infrastructure risks. It's a classic example of a company selling you both the problem and solution.

[ASalazarMX]

That's just an example of incremental improvement. Mainframes and midranges adapt with the times without losing what works. Modern midranges, for example, can run C, Python, bash, and web servers.