I guess I haven't paid much attention to body. It has about the same body as your typical cider of 6-7% ABV would have. You call it "watery" maybe, I call it "cidery"?
If you want apple flavor in a session cyser, I can tell that it truly would be necessary to add some apple concentrate near the end of fermentation. Otherwise, you're right, it's just not there, because of the dilution of the honey with more water, plus the stronger flavor of the honey.