You're the one who said kids would be accessing age gated sites with their parents' credentials. You're the one who made the case that it's useless. Don't go back and forth on it lol

Okay, so those parents can just not give their kids their phones, and everyone else can continue living life as usual without needing a fancy new way of telling websites how old they are

The problem comes in when they feel their opinions should carry weight about other people's kids. There are very limited ways in which we should allow that, and to an oversimplified approximation, they boil down to "don't do kids harm that prevents them from becoming an intact person society treats as a human allowed to make their own decisions". And then the problem is that some people think some websites do such damage, and other people think some websites provide help to survive such damage.