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That is actually a really really interesting question! I don't have any answer to it, but some great responses so far.
Some arts seem 'deeper' than others. And by that I mean there's more to it than meets the eye, beyond surface level and there's a richness and vastness to explore once you have learned a really good foundation. That sounds very vague, and I can't provide much more than that haha.
I guess it also matters what you mean by deeper. More content? More detail? Exploring deeper intrinsic qualities of what you already know at surface level? Continually rewarding or continual learning? Deeper as in philosophical/spiritual?
But I've also seen the exact same art trained VERY different in different schools, some just training it very surface level, and perhaps this comes down to the emphasis of the particular school. If a school perceives the art as purely pragmatic, utilitarian, it may really focus on sparring, sparring strategy, competition etc.
But I have not also stick around observing them for years, so I'm not actually in any position at all to say whether it's a 'deep' art.
So HOW the instructor perceives or frames the art within their own psyche I feel makes the difference here. Hence when trialling out styles it's why I always sit in on the class first and make sure to have a good chat with the instructor. You learn alot about how they carry themselves, how they see the students, treat them, teach them, and in general if you're perceptive enough can gain an insight into how they themselves perceive the art (what it means to them) and subsequently how they teach it (and to what depth).
The passion for the art also would play a big part I would say.
Hope this helps, but would love to hear more thoughts on this subject, something of great interest to me actually, as it's what I'm looking for too
