Maintenance on a folder can easily be done without disassembly. It's a false perception held by many that you need to tear down a knife to clean and oil it. Got blood inyour pivot from skinning an animal or disecting a steak? Use Hydrogen Peroxide followed by a thorough soap and water washing. Got water on a tool steel knives pivot? Ue WD40, compressed air to blow out the rest of the crud, and reoil as necessary. Some folks are allergic to hand tools as well. A torx screw is not the same thing as a hex screw. No all torx or hex bits are created equally either.
Some of it yes, but a spyderco is significantly tighter tolerances than, say, a few common firearms out there. Nobody is suggesting you maintain them without any disassembly, because you can "technically" use a combination of solvents, compressed air, and time/effort to clean it that way. It just doesn't make any sense. You can also draw analogies with cars, bicycles, tools..... really just about anything actually.
Spyderco's warranty isn't ambiguous. In legalese, its pretty clear what they cover and what they don't.
Here is something people seem to be skipping over though: unlike some brands, Busse for example, Spyderco doesn't want to be in the business of selling insurance, they want to be in the business of selling knives. They therefore QC things carefully before they go out the door, warranty the slip ups which may somehow get through, but other than that they really just want to sell you a knife that you can use however you like. If you cock it up, they may fix it, but I get the impression they'd just rather not be in the business of fixing knives. Thats not bad, or sinister, or anything else like that, its just a different business model. Meanwhile Busse, my favorite example, likes to sell knives+insurance so built into the price is some cost for unintentional damage. If you wear your Busse out, it'll be replaced. Spydercos however were designed with a finite life expectancy, and the warranty elucidates that.
I just don't understand why people make such a big deal of it. Buy a knife, use it, love it, don't worry about it. Not everything in life comes with an insurance policy stating, no matter how stupidly you do something, someone else will be on the hook to pay for it instead of you.
As for the bushing pivot system, I'm amazed at the negative reaction to it. I think this is a huge upgrade, both from a functionality standpoint and from a production one. To me, this makes the knife significantly more desirable. If you find you want more resistance in the pivot, put a dab of high viscosity silicone in there and you'll get this beautiful smooth hydraulic feeling to the pivot. Alternately, you can always just get some shim stock and stick it under one of the washers if you're desperate for excessive tightness. I guess this means I should sell off my old barely touched millie as a "classic" to those fans who like the older style, because I found the old style pivot sufficiently objectionable as to never carry it because I preferred my para2.
