If chess is to be considered a sport then using outside help DURING games must be ruled out.
Chess is a mind sport, you win the game by out-thinking the opposition, just as in running you win by running further or faster than than all others. You do not win by running then getting a taxi for a bit, then running for a bit more.
In turnbased chess on chess.com where there is a long time limit on moves players should be playing their best chess, they have lots of time to look at all the possible moves and choose one which minimises the chances of their opponents victory. Therefore it seems quite correct that ratings should be higher in turnbased chess, these ratings are going to be higher than otb ratings obviously, in otb chess u do not have 3 days to make a move!
How can using books to help during games be considered acceptable? Using another persons knowledge to help decide which move u should make, is in my opinion cheating.
In chess it is the individual who plays and therefore it should be the individual who wins. From the top of the chess world down this is the practice, you do not see groups of masters huddling around a single board trying to outplay the other group!
A single game of chess is a game between two people, a battle of two players knowledge and essentially 'brains'. Using a third party is forbidden in over the board chess and so using it in online chess is very seriously questioning whether turnbased should be considered or even called chess.
Hope this all makes sense,
bleucheese
long live the " circle of trust OTB"