To a degree, yes, but it can also be said that it is one of those things that's only as important as you make it. Children, without knowing any differently, are more likely to simply accept a guitar being slightly larger than themselves and take it head on. There are countless videos online of children below the age of ten playing full sized guitars, and it still baffles us even though it shouldn't. Adults are riddled with anxieties, size and weight being top priorities. It only makes sense that as an adult you would worry about these things, and while they are certainly something to consider, it shouldn't stand as a barrier to your development in something that your truly enjoy. small hands or large.