Is AF-On, trap focusing, or 9 frames per second really must have features? I'd suggest they are not. Photography has existed for decades without them and there has been phenomenal photographs made of sports and wildlife, even with manual focus.
My first motor drive a MD-4 for a F3 taught me some quick lessons. At 5-6 FPS the machine gun approach was not the best idea. It quickly became extremely expensive and did not necessarily net me the image I sought very often. Learning about the subjects, anticipating my subjects, and timing did net the images I desired a great majority of the time.
Zone focusing is a means to achieve focused images with fast moving subjects without any auto focus ability required.
To me photography is always a trade off of one thing for another. How do you work around this? What works instead of X? If I make this adjustment what will the cost be in IQ? Do I really need to bring all of that equipment? What about the size and weight? Is the cost worth it?
Photography is all about getting the best image we can within the confines of our budgets, amount of gear and what we are willing to sacrifice to get the desired image. The good thing today is, I do not need all the gear I used to have nor the budget. Camera, lens and equipment rentals can easily fill in the gaps.
Outside of that, ingenuity and skill are still in great demand. I still use zone focusing on occasions. I can get that image I want despite not having a tripod (most of the time). When I do use the high speed FPS, I usually only click off two or three shots. Amazingly enough the first image is the one I usually like the best.