If you read my original response properly, I think you'll see that I mention that a cassette with 28 teeth can be made to work in most cases. Now I realize this is a stretch for you, but people with a moderate grasp of the English language can usually construe from that that the rule isn't absolutely firm. And as long as the derailleur hanger is within the range Shimano specifies - which, believe it or not, pretty much everyone in the industry does (golly gee, I wonder why) - then you can pretty much always assume that at least a 27T big cog will work. All this taking the manufacturer's word for it and not considering my own experience that you obviously have no respect for. At least I'm not alone.
You've made it a little ritual of yours to come on here and spout your emotional diarrhea at anyone who dares have an opinion that doesn't quite mesh with yours in the right way. You're not helpful, you're just a prick, and the bull**** I'm tired of on this forum is yours. Serious advice: See a shrink, get laid, and/or ride more. You've got issues that need dealing with, and I'm sure I'm not the only one around here that's tired of rolling his eyes and putting up with your crap.