If you can find One Perfect Uke that suits you whenever you play, that's great! Don't let UAS bother you; you have what you need.
I have several ukes with very different voices that I play in frequent rotation because 1) I am moody 2) I play different styles of music and 3) I play in different situations (indoor, outdoor, alone, in performance, solo, small group, large group). The uke I love best strumming with two other players at a luau (Fluke concert, fluoro hi-G) is not the uke I sing solo with (Clara, Oasis brights, lo-G). And neither is the uke I'll be playing tonight leading 30 people in Does the Spearmint Lose Its Flavor on the Bedpost Overnight? (Firefly soprano, nylguts, hi-G)
The Ken Burns documentary about Country Music has been re-running on PBS and not coincidentally I've been playing my baritone more than usual.
I don't judge anyone for owning one uke... or 100 ukes. Well, truthfully when I see someone with a whole wall full of ukes I think this person is maybe a little bit nuts, but there's nothing wrong with being a little bit nuts and it's just my opinion anyway.