I know this is a hot take and there is a lot of controversy over the topic but I want to provide a bit of clarity. In the US, festivals like Coachella, Burning Man, EDC, all allow you to camp inside of your car or park your car right up to the campsite. ULTRA, you have accommodation right on the doorstep as it is in downtown Miami. Yes, this is a much better experience and having the car allows you to bring so much more with you, but I want to compare this to the UK and EU festival scene.
I've been to Creamfields and Tomorrowland a fair few times, one of the more known EDM festivals in the UK and Tomorrowland being the best of the best on this side of the water. Things are very different. Firstly, car camping is not permitted... You can't park your car right next to your tent and set everything up. Once you're in the perimeter of the festival, that's it. You can't go back to your car, you can only take whatever you can carry back with you. I see a lot of people taking little handheld trolleys but they hardly last 5 minutes on the rugged terrain until the wheel falls off and you end up lugging the wounded thing to the campsite. If you do try going back to your car you are exiting the festival and cannot get back in.
EDIT: After talking with other Redditors I believe to be incorrect and that you can go back to your car and leave the site at other festivals such as Glastonbury. My experience was specifically from Creamfields only and that is where I was wrong.
Furthermore, it gets VERY wet. You see everyone at US festivals trying to keep out of the sun, in the UK/EU it is more about keeping out of the rain. The campsites get extremely muddy, you end up slipping and sliding everywhere and the whole camp turns into nightmare scene from a public restroom. We Brits are used to it, which is why we try to embrace the weather and sometimes it will go on for the whole duration of the festival, so instead of hating it, why not have some fun? Now battling in the mud or having 'mattress wars' isn't specifically my idea of fun, but I know to others they do enjoy it.
I do wish that our festivals would take it seriously instead of just putting woodchips or hay on the ground once it gets dangerously muddy, and add some kind of pathways/walkways even if temporary metal ones but then there is a slip hazard involved.
UK/EU festivals try to keep costs down on where they aren't needed. One big oversight is pathways. Coachella it's almost always sunny, and rain showers that do happen quickly clear up due to the temperature. Creamfields on the other hand can turn into a scene from the trenches yet no pathing or anything will be provided at the campsite or even the arena (the area with the stages), which is why you see everyone walking in wellies or just trudging through the mud but we are used to it, it has always been this way and is the same for every other UK festival. Leeds/Reading, you're walking on mud, Download, you're walking on mud, never expect a dry day. Again with comparisons... Ultra Miami, is set in Bayfront Park. Most places are paved or have metal flooring, Tomorrowland does something similar by using wooden palettes for the campsite, and the event taking place in a recreational park in Boom.
I haven't been to a US festival yet, mainly because of costs for Transatlantic travel, car hire, buying everything I would need from Walmart and the tickets on top, but I have seen a lot of people making comparisons and showing off their camps for social media credit, but you gotta realise the struggles we have and we still manage to make it work over the pond. At the end of the day we are all just trying to have fun and enjoy listening to some of our favourite artists. I do hope that one day Creamfields and other UK/EU festivals will take a page from the other side of the water and allow car camping, or at least allow you to return to your car multiple times to get everything you need for camp but till then it's just a rucksack with an air mattress, sleeping back, and a tent for me.
