The reality is that resources needed to pursue research are measured in hundreds of thousands and national security budgets are measured in billions in many countries, so your "constrained" claim is pretty much nonsense. That's not even talking about US national security budgets, which are another order of magnitude larger. The US intelligence budget in 2022 was $65.7 billion[1], and there's ample political will to fund whatever intelligence agencies such as the NSA request.

A generous CS PhD salary vs NSA 2013 estimated budget:

           300,000
    10,800,000,000

We can argue over exact allocation amounts but if you're really claiming the NSA can't spare even one researcher salary to research QC security I'm calling bullshit.

[1] https://en.wikipedia.org/wiki/United_States_intelligence_bud...