Mostly because of security concerns and the fact there aren't people capable of running them anymore? A system that isn't broke but no one can operate is not particularly useful.
To get things moving faster.Don't fix what ain't broke. If these systems work, why spend the money to replace them and risk ****ing it all up?
Right up until the last person who knows how to do so retires or dies and no one is left to learn how to operate them. That is the reality the government is facing now. There are just not people who know the code to operate these archaic systems.Sometimes, the fact that the systems can only be run by a select amount of people is exactly what makes them safe.
Pretty sure most of the nuclear armament relies on all this dated tech too which is mind-blowing.
I keep a spare Nokia 3210 which I use regularly. Sometimes keeping it old school is the most safest and reliable way to avoid ending up in a river of ****.
And the malware shouldn't be compatible.There are undoubtedly trade-offs. There is a lot of sophisticated malware around now that probably won't run on an ancient system because the system's memory isn't big enough to hold the malware let alone the malware and the regular tasks together. It would no doubt be infuriating to a serious hacker to build up an arsenal of high powered tools and then find out the system he is trying to hack is so old it won't run anything he has.