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The zvezda russian dragoons also have coats with turnbacks, for some unkown reason (therfore they are almost identical to the zvezda swedish dragoons), so not ideal for wss armies. Although perhaps turnbacks became more popular in at least some armies later in the wss period? I have no source here, just a guess.
Yes, although I have a significant number of the Zvezda Russian dragoons set I'd forgotten that!
With mounted figures it is relatively easy to paint over or trim the turned-back coats to look as if they are full coats, simply split to allow the rider to sit astride the horse.
I think turnbacks started to come into 'fashion' in the 1720s, but some armies eg: the French retained full coats without turnbacks for quite a while longer.
Incidentally, the swords of the Zvezda Russian set are slimmer and less 'broadsword' than the Swedish set; but otherwise they mix quite well.
CS Grant states in his "Armies and Uniforms of Marlborough's Wars" Vol. 1 for the Hanoverian army that "by 1700 the skirts of the coat were turned back producing the turnbacks which were later to be military fashion throughout Europe" (p.71). This refers to the horse/dragoons as I read it but perhaps also to the infantry. There's also a picture of a von Bülow dragoon in Z. Grbasic/V. Vuksic "The history of cavalry" (p-46) showing a trooper with turnbacks. Thus making the Zvezda horse usable for Hanoverians for WSS. Hope that helps.