I hiked the entire Kungsleden northbound (Hemavan to Abisko) in 2015 and have to respectfully disagree with OP on the difficulty. I didn't find it a very tough walk at all, but it's incredibly beautiful!
When I hiked it, I think I was very lucky with the conditions. Although I started on 1st July, there was still a lot of snow around, which made it more scenic. It was also a lemming year, so there were tons of lemmings and predators that hunt them. I saw stoats, many short-eared owls and I had arctic foxes near my tent! I even saw a snowy owl!
I have a long walk report with many pictures in my signature link.
https://www.hikingbirdman.com/kungsleden/