Umm, maybe because the old screw-on ones from 1969 are still working fine on my dad's old 041 Farm Boss. Or maybe because when one fails and you're way out in bim-fock-nowhere you've got no choice but to throw in the towel and go to town to buy a new one. Or maybe because they are okay with replacing an air filter that gets gunked up over time, or a chain that eventually wears out, or the oil and gas because they got used up, but they are not okay replacing with a critical non-wearing part that seems prone to snapping at a weak section of the device.
I'd expect this sort of engineering out of something sold at Wal-Mart. But I buy Stihl products because of that old 041 Farm Boss, because a 40 year old Stihl still works. I'm not sure that a new Stihl will have that sort of longevity. So why not just buy Wal-Mart crap, if it's all being built that way?
I'm not "so offended", I'm just disappointed that a company I trust so much has embraced these caps. If I owned one of these saws, I'd always carry a replacement of both the oil and gas caps. Frankly, I'd rather just carry a scrench or screwdriver instead, and use the old style of caps. It's why I'll fix my old 026 instead of buying a new saw.