I agree gentle parenting doesn't have to be like this, and it's possible to have a gentle philosophy, and boundaries and structure.
But a lot of the totally permissive ones will still call it "gentle" parenting and thiunk that's what they are doing.
Some PP's have said it's laziness, but IME parent like this I've known, it's more that they are scared to ever upset their child, for fear of being disciplinarian, causing some kind of damage or being hated.
One friend admitted she couldn't bear to do anything that made her DC cry. They were 1 and 2 at the time! So she wouldn't bundle them into the buggy to avoid being late somewhere, or say they had to hand over a toy etc. because she saw that as being cruel, they would cry and she'd feel bad.
I mean FFS babies and toddlers cry when they're thwarted, that's what they do and totally normal (I thought but didn't say!). But somehow it made me feel mean when I would say no to mine!
I once talked to another mum in a playpark whose child was really harrassing mine - pushing her off everything she tried to have a go on. I tried to nicely ask the child to take turns - no luck. The mum came over and apologised to me, but wouldn't say anything to her 3yo. I said, as reasonably as I could, "you could tell her to stop, or move her away for a bit". She just looked at me like a rabbit in the headlights and said "But... she'll be upset". Well no shit sherlock.
I think it's this weird over-reaction against excessive discipline. I'm totally anti-smacking and I'm very glad it's largely in the past, but I think some parents extend it to see any kind of discipline at all as cruel.