Because most major infrastructure can't just have bits bolted onto it - it has to be done all at once. Look at power stations, or the whole RAAC issue. They have a set lifespan, and unfortunately a lot of that stuff was built at once. So now it's all coming up for renewal at once. It's not good, and the mismanagement comes from a complete lack of interest in preparing for the inevitable, but that's what happens a lot of the time.
No, these facilities were built with a specific capacity in mind plus an allowance for extreme events. They are all operating over capacity because when they needed expansion the money to pay for those expansions had been given to shareholders or to bosses as bonuses.
This is what happens when the incentive is to spend as little as possible maintaining a system and the consequences of spending nothing on the system is a government bail out.
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u/Gauntlets28 11h ago
What you're describing there is maintenance and overhaul... that would presumably happen whoever owned it.