This hardly reqires a response (based on your original premise of marketing and appearant understanding), but I can understand your frustration. Fact is, most el84 amps that are cathode biased idle at, or close to 100% dissapation. MFG's like to call this class A because the term has mojo. But when these amps are pushed the cathode voltage rises disproportionate to the sag in the B+ supply and the amps end up in AB1 (more +V at the cathode is the same as more -V at the grid). So... Even though these amps are technically biased class A they end up in AB1 during operation. A distinction that has long been ignored, probably for marketing purposes. Even the Vox AC30 ends up in AB1 when overdriven. But try telling a non amp building original AC30 owner that his amp isn't class A.?. Be ready to fight about it
Edit: Just to clarify... In order to be an actual class A amp the AC30, most 18 watters, some Matchless amps, etc. would need to reduce the power tube grid signal voltage to avoid pushing these amps into AB1. Technically these amps are biased class A. But IMHO that hardly counts since an amp being played is not idling.
I recently designed an amp that may go into production. It is el84 based, cathode biased and idles at or near 100% dissapation... We may decide to call it class A for marketing, even though it's really not IMO.