Can you suggest a better way to phrase this?
IMO, it's no different than a manufacturer choosing to make a 1/4" plug larger than 1/4" and not fitting the standard 1/4" jack (which has been done and resulted in some bent up contacts on jacks), or a bass builder choosing a scale's intonation that is different than everybody else. How about making a wrench that everybody else calls 1/2" yet is slightly smaller and won't fit most standard 1/2" bolt heads?
Wherever possible, I follow industry standards. Why? Because it makes things so much more compatible for everybody, and it minimizes this kind of inconvenience. When a product is compatible with 99.99% of all plugs sold on the market, an oddball plug that won't fit is the outlier, not the amp.
Incidentally, exactly the same issue comes up with 1/4" and TT patch bays. They are designed with a particular spacing to be compatible with all standard diameter barrels plugs, most won't even accept the standard Jumbo size, but this is accepted since the Jumbos are almost always reserved for speaker applications only.