Perhaps we're not talking about the same thing. 'Body' of hard cider typically refers to taste and depth/layers of flavor, and not how much floating particulate is left after fermentation. You may have read some bad information regarding the relationship between the density of raw cider and clear juice. When cider is filtered to become juice the density will not change since you are only removing suspended solids which only displace liquid and not the dissolved compounds which effect the density of a liquid.
Not sure why you think naturally derived tannins would leave a chemical taste, maybe you could expand on that thought.
Cider making is definitely like wine making, but with apples. The techniques and process are practically identical not to mention equipment. Delicious ciders are commonly made with wine yeasts as well as with ale yeasts, and as covered, have no dissolved apple solids in either the raw or finished product.
I guess opinions are like .. wel you know.
I have alwayts hated the wine tannin stuff I feel like it imparts an almost unatural flavor on cider [maybe because its derived from grape tannin]
I do add crab apples when I grind for added apple tannins.
I know in the wine world tannin is what is counted on for body. However if you get a glass of apple juice, and a glass of cider side by side and sip each you will notice the juice feels thin and weaker, even from the same grind.
The style I like is comonally refered to as country cider, as soon as its done fermenting dry its siphoned off, primed and bottled. This leaves some suspended yeast and apple solids still in the cider. It usaually ends up a single stage fermatation [more like beer than wine] with an aprox6-8% abv cider.
The crystal clear cider is more of a euopean style, I find them more akin to wine, as the processes are more refined.
My definition of cider like yours is fermented from apples, but thats about where the line is.
I have played with euro style ciders [repeated rackings, acid titration, finings, ect ect] Im not a large fan of them [except cyser]. I also grew up on farmhouse style cider.