Lightweight and strong are always going to be somewhat at odds with each other. The more you go towards one side, you compromise the other.
Personally I’m a big fan of the Hilleberg Akto. It’s light enough but a very strong proper four season tent. I like mine a lot. In the Hille range you’ve got the Soulo which is a step up in strength but heavier, and something like the Enan which is lighter but less robust.
IMO the Akto hits the sweet spot for four season UK summit camping.
Someone above mentioned the Tarptent Scarp which is a similar kind of tent.
The Fjallraven Abisko also falls into the same bracket.
None of these are cheap but they are brilliant quality and brilliant strength to weight ratio.
Not sure I quite what you mean for any other tent. Some of the tents I linked above are super-easy to pitch (Hilleberg especially), and by design pitch inner and fly together.
At 900g with poles, the xmid is somehow only 100g lighter than a Hilleberg Enan. Considering the relative performance, this puts the xmid in the extreme heavyweight category of tents.
Do you have a budget in mind? Size requirements? Trekking poles, or tent poles?
My tent is light and waterproof for sure (Hilleberg Enan), but there are plenty reasons not to choose that one.
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