What other changes will be easier and better?
Well, for example, it's much easier for me and my family to go without meat than it would be for us to avoid flying and never see my DH's side of the family again. I imagine that some families would find it easier to stop flying instead.
Likewise, it's easy for us to walk/use public transport most of the time, and to have only one low emissions car between us, which we rarely use. However, for other families, with different circumstances, that would be impossible, and it would be much easier for them to give up flying.
Some people are happy to limit the size of their families to only one child, whereas others think that siblings are essential and non-negotiable.
Of course, there's an argument that we should all stop at one child (if we have children at all), go vegan, avoid flying, avoid car travel etc etc. In an ideal world, that's probably true, but the reality is that very few people are willing to make sacrifices in all areas of their lives, and unless you legislate, it probably won't happen.
My point is that it's easy for people to preach to others about the changes that happen to suit them, while merrily ignoring the ones that don't. Personally, I'd rather that people save the virtue-signalling lectures about what others should stop doing, and focus instead on what they can do themselves.
FWIW, I think legislation is the only way forward. We need to force change, as it won't happen otherwise.