I would suggest to be clear, specifically counting allocated seats before a flight is not generally a good way of estimating the number of booked passengers.
Your post IMHO, with its generalisation unfairly denigrates Expert Flyer.
A better way is using the fare bucket availability information provided by experts flyer.
For more on that, see here:
I'd appreciate some help understanding the information EF provides. For example, F6 A6 J9 C9 D9 I0 B9 H9 K9 M9 R9 L9 V9 S0 N0 Q0 O0 X0 E0 What letters do I look at to try to work out how many seats are still available in economy? What letters do I look at to try to work out how many...www.australianfrequentflyer.com.au
Sorry. I made a specific reference to counting seats, and if you look at the thread, Mattg implied that if one counts 'heads' on the EF site before a flight departs, it tends to be inaccurate, underestimating the number who end up travelling (a few of whom may be staff).
However I now know one can count using EF after a flight has departed, which has been irrelevant to me as I only ever used it prior to a flight on which I hoped to travel, to ascertain if it was close to full or far less well booked, so thanks.
I have never subscribed to EF.