However I still wonder why everyone still mixes tapereading with watching the limit order book. Time&Sales first, then watch how the book reacts to the transactions.
Up until not so far back (about 25 years ago or so?), the most granular market action information was T&S. Exchanges did not publish their LOBs. So, yes, "tape-reading" was effectively interpreting T&S, unless you were a floor trader/specialist who had the privilege of a deeper look at the order flow.