I am dissing the 90EX for it's original purpose. It is a POS.
I am the one who is being called ".. a semi-pro wanna-be like some that bemoan its ability to trigger other off-camera flashes....". But I am not the only one who has pointed out "I only used it as an optical master, and it didn't perform well in that role." or "I tried to locate my slaves at various points in relation to the 90EX optical master and found they had to be within maybe 60 degrees of the direction it was facing or they would not fire"
As for saying this "That's the more ridiculous and over-the-top statement than anything I have said so far..." about my comment "Guys don't get too excited about the 90EX, I got one in an M kit, it is useless; utterly useless as a flash, or even for fill, its only practical use is as an optical master but even then it is somewhat limited having no power, bounce, or swivel capabilities."
My retort would be this image. This was taken with the M and 90EX, I was shocked at what I thought was the bad performance of ETTL in this situation so put the flash in manual and full power, turned out it wasn't the ETTL.....
EXIF: 1/30 sec, f5.6, iso400, manual flash full power, the ambient light levels are low as it is early evening, the subject about 4-6 feet from me, you can tell the flash fired because of the catch lights in the eyes. Batteries were brand new.
Now call me a "wanna be pro" all you like, but if a dedicated flash can't provide on axis fill at 4-6 feet in EV8, for a real world guide number of under 10, then it is a POS.