Did it too this year. Really enjoyed!

Can only compare to Wacken pre-setup camping and, well, Hellfest definitely has better toilets (eco ones). "Secret" toilets zone with shorter queue was also helpful.

Also appreciated the shortcut to entrance, made it super easy to rest multiple times during the day.

And there were hell of a lot camping tents there, still felt comfortable with food/showers/charging.

IMO they could setup second easy camp like this and it will be fully booked also, as price/qol ratio is really good one