LOL! The basic message is that a good radio built around the Open TX standard is the way to go. It's not that difficult or complex of a decision. Radiomaster TX16S is a no-brainer choice today. Full featured, open platform that supports basically any drone. Crossfire is a Team Blacksheep control link that gives you 30+kms of range but the range limit for FPV is limited by the video transmission which is around 5-6kms with a good VTX. With crossfire as your control link you never have to worry about your quad having a failsafe (loses communication to the radio and falls to the ground) because your radio link is capable of 30+kms but your video can go 5-6kms.
This is the technology you will want in FPV so when you buy something make sure it leads down this roadmap. The battey size will determin the flight time. Most people fly freestyle FPV drones want the best performance so battery size and weight are kept to a minimum for performance and thus you can expect 5-6 mins of pure performance. Sounds like a very short flight, but when you're flying balls to the wall acro, it's long enough. Other drones have smaller more efficient motos ans some drones like the Flywoo Explorer can fly for 30min with the proper batter, but this will e more of a cruising type style of flying. The point is that you can buy or build a drone to meet any flight characteristic you want.... Super fast insane performance to slow and steady cruiser or anything in between.
Check out RCAddict on YouTube for some sample videos of his race setup.
Jump ahead to 3:00min... This will give you an idea of performance capabilities of these small drones. He's flying in acro mode LOS which is mighty impressive! Your mavic can't do this!