In order to be able to design equipment, the instrumentation generally needs to outperform the equipment, sometimes by a significant margin. If I'm looking at the eye of a digital signal, I need to capture much faster than the signal.
It'd be fun to have a book of tricks from this era. At some point, it will fade into obscurity. Right now, it's a whole different bag of tricks for the state-of-the-art. They feel less... more textbook and less clever.
On the other hand, what's nice is that in 2025, decent equipment is cheap. There's a breakpoint where below around 100MHz, you can't do basic work, and above you can. That's roughly where FM pickup and a lot of oscillations sit. That used to cost a lot, but as technology progressed, we're at a point where a decent home lab can be had for well under a grand.