No, but when people rely on a product to do what it says on the tin, it should do what it says on the tin. Marketing claims are one thing, saying something breaks at 11.9lbs when it breaks at 9.8 is crap.It's not really surprising that sizes and strengths vary. Company's are there to make a profit. A little manipulation to find their market share is standard operation. Marketing and hype rule the day. Just look at the fly lines. Is it really a 6# or maybe a7#.? Well, spend another $100 to find out which one you like. Buyer beware..
Also, if I were pursuing an IGFA tippet class record, and my tippet stated it was 12lb, but it turns out to break at 16lb, then I'm not gonna qualify for the record because IGFA is gonna test my tippet and check my fish against the 15lb class.