Admittedly this was back in the pre-second-coming-of-Steve days and in the interim between the 68xxx to PowerPC transition and the rebranding of PowerPCs as G3, G4, G5. But all PowerPC Macs in the mid 90's DID have a non-removable (fairly tacky StarTrekky looking) PowerPC badge on the front to distinguish them from the 68xxx machines. So it's not as if it never has or never could happen...a quick Google image search confirmed my memory of this...here's a few...
Performa 6360
Power Mac 7500
PowerBook 5300 (see it at the top in this blurry pic?)
It's not that offensive, is it? If nicely engraved and unobtrusive an Intel logo wouldn't be the end of the world. But I would expect it on the back of the towers and bottom of the laptops, since the current designs have been so minimalist. The front of the G5 doesn't even have an
Apple on it, so I doubt they'd prominently feature an Intel logo.