Gentlemen, with regards to the Tachyon, we're beyond the "initial advertising" stage. We're into the "final product delivery" stage, with no change in the wording of the advertisement (and Mike has already updated the website at least once). Mike and MT made it a point to stress the value of the "user interchangability" feature. Otherwise they wouldn't have mentioned it as one of the FOUR (4) main advantages of buying the Tachyon. Given the amount of thought that went into designing the Tachyon, I would be very surprised if that feature wasn't deliberately designed in. And for them to retreat from that marketing strategy, and hide behind warranty fears, makes no sense to me.
I can understand why BM would be hesitiant to allow customers to do their own blade changes, as the removal of the tang pins require some level of skill to pin punch the Chicago screw safely out of the pivot hole. If someone isn't careful, they can easily damage the screw, fracture the pivot hole, or hurt themselves using the hammer. The same is true when you install the pivot pins. Hammering those pins back into the handle isn't simple SOP for most people.
Those dangers aren't there with the Tachyon. As mentioned by Pigsticker, we're not talking about a complicated spring loaded auto here. We're talking 12 insert screws (T8), 2 pivot screw sets (T10), 1 latch screw set (T6), 4 bronze bushings, 4 handle slabs, 2 inserts, a latch and the blade. And all you really need is 3 torx wrenches (and one or two pin punches, but no hammer required). There's not much that can really go majorly wrong by a customer taking one apart. The worst case I can see is for the customer to strip the threads on the inserts, but that step is not necessary for swapping out a blade. If you consider the blade swap as the most a customer will do, the worst case is for them to damage the pivot screw. Call MT and they'll send you another one.
But that's the question here isn't it? What is really covered under the warranty? And will Mike and company stand by what they promised to the customers? As well built as the Tachyon is, I'm even more impressed with the simplicity of design in the way it was put together.
Now, if Mike comes back and says that we never should have received those warranty cards, then this whole conversation is moot. And I pray that's all this needs to be.