I'm not going to flame you for it, but can't you see that willing yourself to be normal won't make you normal?
Many of us have willed ourselves into being normal until we've had mental breakdowns, relationship breakdowns, ended up sectioned, asking for voluntary holds, lost jobs, been abused, lost skills we previously had, developed cPTSD.
One of the criteria is that the traits presented must be substantially disabling. You don't get a diagnosis if you're not substantially disabled. I know that's probably hard for you to see as you've not been through the diagnostic pathway, but the assessments themselves are like walking through the circles of hell on your hands and knees, being flagellated as every single thing in your life is pathologised against your will.
I also understand your point of view that you think the diagnostic criteria is being diluted, it isn't. Support needs are recognised even if they're not labelled at diagnosis. There will always be those who are higher support needs and those who are lower support needs, but the lower support needs people are still substantially disabled by having autism or ADHD.
In a way, for late diagnosed people it does rewrite the past. That's not a bad thing in context. We also don't all view ourselves as perpetual victims either. If that's how you view us, do you think the same of blind people for living in a world that isn't accessible to them? I mean, people don't always respect that guide dogs have a job to do, or move out of the way, or recognise the tactile pavement they're hogging is necessary for people using a cane to determine where abouts they are, and people who are distracted by phones, kids, chatter, often bump into them. Does that make them perpetual victims for having a disability that they can't control? I don't think they'd think kindly of being viewed as a perpetual victim.
The world isn't built for them, no more than it is for us, but your inner sense of ableism is telling you that if we make our needs known and they're habitually not met that we're victimising ourselves.
Anyway, I don't expect I can change your mind. You think what you think and that's that, but sometimes we need to check our inner narrative.