I'm 51.
I'd say I practiced 'gentle parenting'. If I had to put a label on it.
Not intentionally because my children were too old by the time it became a thing! But I grew up in an abusive household and raised in fear, shame and humiliation. I didn't want that for my own children. So I deliberately raised them differently.
There were boundaries, consequences and expectations but I've never 'punished', shouted at them or smacked them. We talked and had had restorative conversations.
They're 18 and 26 now. One is a naturally easy child, the other isn't but I've never had any 'problems' with either of them. They were both praised at school for their behaviour and emotional intelligence. One is a graduate. The other is at university. They both have a good work ethic and have both been recognised at work for their positive attitudes towards work, relationships with colleagues and initiative. They've both volunteered. They're independent, self confident and resilient.
The biggest problem I see is that, as has been said many times on threads like these, a lot of people who claim to practice 'gentle parenting just aren't parenting at all. The children call the shots, they're never allowed to be upset or feel disappointment or frustration so they never learn how to deal with those perfectly normal and unavoidable human emotions.
But there are problems across the board. There's a thread in AIBU at the moment by a woman who doesn't like the tone of a message from her 18 year old daughter. Some of the responses are ridiculous - suggested responses are petty, punitive, combative and retaliatory and just aren't going to elicit a positive outcome.
The problem is that a lot of people don't have very high emotional intelligence, don't have any understanding of child development and normal stages of development or just assume their children will grow up knowing how to be a part of society and manage themselves and their emotions without any understanding of how they influence that as parents. Or just lack the skills themselves that we should all be instilling in children (eg resilience etc).
I never saw my children as 'mine' though. I raised them to be members of society - a part of the whole. As children, I didn't see them as precious things I should 'protect' from the world at all costs. But as part of that world. And that doesn't mean I didn't protect them either. I haven't had contact with my mother for 13 years in order to protect them.