Most of my wild camping is done in the Lakes/N Wales/Scotland. I always like to camp near water and finding a spot that is isn't boggy and flat can be enough of a challenge without adding perfect peg placements to the mix.
I lighter tent would be nice, but there is always more kit I want. Being an impoverished outdoor ed instructor with lots of hobbies means tough choices, along with I can't afford super light kit that dies more quickly as I use it so much. Still annoying when clients have nicer kit then you.
The maxim is tough, light, cheap. Choose two.
My cousin is just back from Afganistan and carried a 40/45kg sack into battle. Did make me wonder what I was moaning about with 18kg. Main thing that comes with a lighter tent though is small pack size and it would be nicer to carry a smaller rucksack.