It really is not as complicated as the author implies....really...you pay $25 for the first bag, $35 for the second, up to 50 lbs each, each direction.....unless you have some special situation, which would make it CHEAPER.
Note that "CHEAPER" is a variation in the baggage fees.
"$25 for the first bag, $35 for the second,..."
Unless you're going trans-Atlantic, then the first bag is free but the 2nd is $70. (two variations from the "standard" $25/$35)
Unless you're going trans-Pacific, then the first 2 bags are free. (2 more variations from the "standard")
Unless you bought your ticket to Europe before 7/1/2011, then the 2nd bag is $55 (another variation from "standard")
Unless you bought your ticket after 11/15/2011 and going to TLV, then the 2nd bag is $70. (another variation from "standard")
Unless you bought your ticket after 11/15/2011 and are Silver preferred, then the 1st bag is free (another variation)
Unless you're Gold or higher, then up to 3 bags are free (another variation)
Unless you're going to/from Brazil, then 2 bags are free (another variation)
Unless you're military with ID with travel orders, then 4 bags up to 100 lb/each are free (two more variations)
Unless you're military on personal travel, then 2 bags are free. (another variation)
Unless you're confirmed F/C or Envoy, then 2 bags are free (another variation)
Unless you're only Star Silver, then 1st bag is free (another variation)
Unless one or more of your bags are overweight, then overweight charges apply (more variables)
Unless one or more of your bags are oversize, then oversize charges apply (more variables)
Now go through all those for two people on the same PNR. On separate PNR's. Both Gold. One Silver and one no status. A family of 4. And that's just for US - now go through the variations for AA/DL/US/UA/WN.
Sure, it's not complicated at all - the average passenger should have all that memorized for every airline....then one or more airlines make a change...LOL