I do
I mean slow in terms of innovation, which they stagnate on
But also performance actually
Their TCP\IP stack is one such consequence. It doesn't have any of the massive changes that happened in the last few decades that have optimized performance
Open source stacks picked those up immediately. Windows, and other older platforms still use a much slower and more poorly designed stack
That's one such example. Plenty of others
It's not that they can't solve problems. They can.
Steam engines can solve everything too. But they are not the best at every task and these days it's hard to find anything that couldn't be beaten otherwise
Mostly these systems ONLY exist because of legacy
It is why none of the big compute players have touched any of that in decades. Because it is dead technology and a dead end
I know right!
I think this is another case where even the engineers got sold into the marketing
Because they heard three decades ago that this was the fastest best technology, and IBM sold it to them
... The reality is, these technologies nobody uses for anything new and there's a reason why. They are just too ancient and stagnating
Plus, other technologies are open and you can see how much more innovation happens when you allow that. Mainframe never had that and that's why it sat around