I've been listening to that rationale for fifty years. Find it for me in Article I Section 8.
You don't know what the practical aspects of this research are.
Neither do you. I DO know what research into the soil microbiome or hydrology could yield, for example, at a pittance compared to this work involving high-dollar equipment.
There is a lot of research to do. It all costs money. We're broke. I want what is spent to foreseeably yield a profit with which to fund more research. It is knowable what the likelihood a particular project might yield within an acceptable time frame. When the elements under consideration are so ephemeral it is knowable how little.
Because we're broke.
I understand very well the budget problem, but that could be solved by simply removing a lot of entitlements, subsidies and tax breaks, and especially reforming the DOD procurement system. That's simple to see and impossible to do politically.
I strongly suspect nothing will be done about any of it until we face national bankruptcy or a major war forces a complete reorganization.