Exactly this, DJI uses an external head tracker module/system thats ~$70 US (for the caddx system) + set up time. Walksnail has it built in so you just need the gimbal, vtx, and goggles. I dont recommend the goggles x in general, but if you want hdmi/the extra features you have to get them. I had the budget for those goggles, but still went with the goggles L. That being said, I. also have HDzero and they do hdmi in/out, etc. The only reason I bought into walksnail was to try the native head tracking, it's still my 4th place system behind dji, analog, hdzero.
You probably want walksnail for your use case, but if you fly a lot and have building experience, I would still potentially recommend DJI. It's the best overall system and you get more/better range, I just dont know how the head tracking set up will go.