The Facebook groups are typical of social media on a whole, full of absolute tosh and dreamers. You've got the "faces" who run these pages surrounded by every brown nosing boot licker on the planet and not one of them is worthy of the title foxer..!!
They rock up in all the gear, climb the five bar gate, set the rifle up on a tripod, switch on the caller, spot with the thermal, shoot with the NV, and back home in time for Love Island, foxing my arse..!!!
Having said that though moving on to your other point, technology as come on leaps and bounds and I do believe the 400 yard shots are achievable given the right conditions and that's the point, absolutely every possible aspect as to be perfect. I've been foxing a long time and I can count on both my hands the amount of times I've had those condition, so it just goes to show these people are just playing at it, and you'll only ever see what they want you too..!!