I'm actually hoping for the harshest of MN contributors to give their verdict on this one, because I'm not sure. 18 months old in the grand scheme of things is still really young, and they're at the pinnacle of their separation anxiety phase. So I'm wondering whether there's such a thing as being "too attached" at this point?
(To clarify I'm talking naturally, not because they've been nurtured in an environment that fosters zero independence/total reliance)
YABU - Yes of course an 18 month old should be fine to do X/Y/Z by themselves by now
YANBU - Some children just aren't ready at that stage and that's fine