Decks are extremely functional & fit for purpose. They may be 'new' to the UK but have been around in the USA for yonks.
Last deck I built; French windows from lounge had a 14" drop to scabby concrete patio, so doors never even opened let alone used.
Kitchen door to garden (at right angle to patio doors) had an 8" drop to concrete, then after 3' level went up by 3" onto uneven old slabs. Then 18" drop to garden.
No access for mini digger, nearest skip would have to be 20 yards away.
One week & £2K later = 300 sq ft of user friendly practical space with minimal disruption. Cost to remove old patio & slab in would have been somewhere like 5 times that and taken months.
So ner ner ne ner ner :-)