Pretty sure the same kind of thread (if not threads) exists from iOS 7 days as well...given what the dock looks like in iOS 8 it seems like all those votes, feedback, and/or things of similar nature (unfortunately) didn't get very far, and likely won't at this point either.
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In fact, amongst others, looks like I just came across almost exactly the same kind of thread about this from iOS 7, and just realized it was posted by you too: https://forums.macrumors.com/threads/1604541/
It only took about 8 iOS versions to get quick reply...so I guess somewhere around iOS 15 we might get something along the lines of a more transparent dock (or just a completely redesigned one based on whatever design will be popular at the time).Well, people did ask for quick reply and we got it? Faster animations? We got 'em. Anything is possible. Tim Cook said it himself, he does read his emails.
It only took about 8 iOS versions to get quick reply...so I guess somewhere around iOS 15 we might get something along the lines of a more transparent dock (or just a completely redesigned one based on whatever design will be popular at the time).