It really depends on what you mean by "decades", but I've been in the system for a generation and what you're saying doesn't match what I see on the ground.

During the doubling of the NIH budget under Clinton and Bush the younger times were great. After, budgets stagnated and things were harder but there was still funding out there. The disruption we're seeing now is a completely different animal: program officers are gone, fewer and less detailed summary statements go out, some programs are on hiatus (SBIR/STTR) and if you have something in the till it was wasted time, &c. NSF is a complete train wreck.

My startup had an STTR in for the last cycle and we can't talk to the program officer about our summary statement, nor can we resubmit, nor are we likely to be funded. That's a lot of lost time and money for a startup that, since we're atoms and not bits, is funded on a shoestring budget. The only time something like this happened in my memory was the shutdown in 2013 and that wasn't even close to the disruption we're seeing now.