"Secondly it allows for a much stronger construction supporting heavier bench tops (marble, granite, concrete etc)."
While technically true ,if you have all kinds of scientific equipment to measure the sorts of failures that this might prevent , out in the real world this akin to solid wood is better for cabinets than plywood or mdf or partical board.
In other words - it's a myth.
The euro cabinets I've used for near on three decades have 5/8 sides and 1/4 backs and we have had zero , repeat zero, failures in compression because of heavy tops. Been using granite and concrete up to 8cm thick - you can do the math on the weight.
Solid backs are a waste of resources and energy when moving them. Use 3/4 backs if it makes you feel better ,, but it's not necessary. And if you want to argue the numbers, be sure you calculate in the unbalanced load on the front side because there is absolutely no support because of the drawers and doors. And if you bring up face frames, then be sure you correctly calculate the weakness of the door and drawer openings and the weakness of the joints at the rails an stiles.
Like I said , if it makes you feel good to have a belt and suspenders fine. Neither are necessary if your trousers are fit properly though.