0hday/Zeroday/0-day exploits should be the least of your worry. Adversaries mostly wont be using them*
It makes vendors seem like they are solving the impossible, but in reality it's all mostly shit. Time and time again we've seen this play out, but we are a magpie industry where shiny and new trumps the basic and known.
There will always be some targets that warrant the use. Often it boils down to a simple equation
What you have + your OPSEC * CAPEX of your adversary ='s use case.
If you are deemed attractive by a regime with unlimited capital, then your threat model is different to most