That was Walt. Walt was semi-important. He reappered in later seasons. He wasn’t like Henry who is really one of the central foci of the entire show.
Also, the storyline of LOST occurred over a more condensed timeframe, so it was a whole different situation where they actually couldn’t keep him around while the actor aged normally over several years.
I don’t get the controversy, either. Kids grow up. Yes, they’re in Neverland but I don’t think they’re going to be there for years so it shouldn’t be an issue. They already alluded to Henry growing up with Mr. Gold’s little dream about killing Henry on his birthday, so I don’t think it’s going to be that big of a deal.
Well, we dunno yet just how long they’re gonna be in NL, most are guessing at least half a season, I wouldn’t be surprised if it’s longer. Anyway, time in NL passes at a faster rate, so to speak. I just think it could be fun if they actually do use his growth spurt in the story somehow. Like, they could use it to sort of define just how much of a timey wimey discrepancy there is. If they get back to SB and to the SBers they’ve been gone a week, but Henry appears to have aged a year, that could help flesh out the laws of NL a bit in a cool way. (Of course, that’s assuming they wanted to write it as him being able to age in NL, but given he’s the only one who could age in SB, it would be consistent with his characterisation so far.)