Semantics, and irrelevant to the issue. Mixing materials of different harnesses in a manner where friction is a factor is, well to be blunt, amateur. Amber has a harness similar to nylon. The rubber coating over the "Glass fiber reinforced polyamide" hardness much less. Plain and simple.
FYI, I design transformer substations not micro switches. If a customer complains about a control component, I scrap it and get a better one.
They would still be saving money. This ones basic math. Switch A costs 5$ switch B costs 10$. X= B+B = 20$, Y = B+A = 15$. X > Y.
Single part cost of an NKK G23AV: $7.70/ea
Single part cost of the rear, metal power switch: $2.90/ea
We continue to use the relatively expensive NKK brand because they're appreciated. We've evaluated a long list of alternative switches; cost is not part of the decision process. We maintain records of all customer issues, and your broken toggle is an isolated event covered by our 2-year warranty. Unless unreported, no other C5 or C5D switches have been damaged. That said, I've worked as an electrical engineer in high reliability industrial environments and understand your concern. The NKK switches meet long-term reliability expectations and outlast the product warranty (NKK G22AV was used in our c421 amp). If there's demand for a Toughbook style amp/DAC, we'll build one. Or have a look at Objective2.
Machining: Our machinists inspect each batch of endplates as soon as they're removed from our Haas CNC for a post-machining cleanse. As a secondary measure of protection, we use custom trays in the engraving process which physically cannot accept misshaped parts. And to ensure maximum quality, we've recently required our head of production to inspect each batch of machined parts again after engraving. Bad parts are rejected at each inspection point and are sent to a recycling bin. Only acceptable parts make it to our assembly department.
Engraving: Regardless of the application method, we've found that silkscreen and engraving processes onto silver endplates can wear off after significant physical contact (usually measured in years). Laser engraving onto black anodized aluminum is far more robust since it physically alters the oxide layer and cannot be removed. If customers were unhappy, we'd discontinue silver endplates. If you have any concern about long-term artwork wear, black is a better choice.
@PinkLed: I'm sorry C5 has mechanically disappointed you. All products should match the photos at JDSLabs.com, and outlast their 2-year warranty. We'll be glad to refund the amp or replace the entire unit. Let us know what you prefer.