I agree & I’m usually one to advocate not asking about pregnancy. I think it’s such a personal & private thing - but unfortunately they haven’t kept it private themselves, so I do understand why fans ask about it.
For Elle, the situation is slightly different because they haven’t actively spoken about trying for a baby & they haven’t really given a timeline (that I’m aware of). But with Carys & James they’ve been talking about it for such a long time, they’ve often answered questions about having children & given details like timelines etc. I remember their video where she pretended to be pregnant for a day (in public) & a lot of people reacted badly to that. I remember her justifying why they made the video & said it was just a bit of fun, I’m sure her fans would say the same when they comment about pregnancy on her photos