
Having a kid while constantly travelling is far from ideal and really not recommended at all. Kids need stable connections outside their parents; they won't be able to keep these connections if they never stay in one place for long-- people in general are like this, but it is much harder (and I'd say maybe impossible) for a kid to navigate this than it is for an adult. He might want kids in theory, but he probably doesn't want them in practice.

Makes sense but I was thinking about something like still doing it, helping people to know more about it and finding the way to do it, and just travel a lil
then when the kids a lil grown they can travel all together maybe in holidays?
I mean..Itsoumi himself was only ten when he started taking interest in it.
Seeing how he also need to save money to travel making me think it's not like he stayed home for a week and fly for months

It's possible to work around it, but Itsuomi's priority is his dream, so "working around it" is not what he wants; as with everything, after all, there are ways to compromise, but Itsuomi still needs to want/accept that compromise. If he doesn't, then he's really not to blame.
Plus, the fact Itsuomi started taking interest in this when he was 10 doesn't mean much; his kid might hate traveling, might hate having to leave behind any friends they make so often, and might hate Itsuomi for traveling so much too. And Itsuomi can't hide from the responsibility towards keeping his (hypothetical) kid's well-being; it should be a priority, not something he manages on the side of his big "day job."
Like, it's already stressful to be a parent when *not* traveling, so this – together with the fact Itsuomi and Yuki would be first time parents – is a whole new level of it. It's very understandable that Itsuomi might like kids but doesn't want to have them.
I understand Itsoumi's dream and all..but why y'all assuming he doesn't want kids because of it? Yuki just guessed it but he never said it, no? I don't want him to give up on such a dream but I still want them together