MPs should keep their mouths shut about things they know nothing about
So a system that is driven at, or close to, full capacity every single day had a few minutes delay when an abnormal and previously unheard of scenario occurred?
This isn't the problem. The problem is that the service the system is supporting does not have any spare capacity which means every delay has a knock on effect in that flights are delayed or need to be cancelled.
No-one was killed or injured because the system went bat-shit crazy and caused planes to collide, people were just inconvenienced by a relatively minor delay.
Older systems are typically tried and tested and most faults have been found and resolved/worked around. Newer systems may be faster or have more functionality, but have a whole new legion of bugs yet to be discovered.
I vote for the slight delay with legacy hardware instead or the shiny new hardware that shits itself because flash player has been updated for the 5000th time.