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Why are digital streaming equipment manufacturers refusing to answer me?

I have performed double blind tests with the most highly regarded brands of streamers and some hifi switches. None have made any difference to my system on files saved locally. I have asked the following question to the makers of such systems and almost all have responded with marketing nonsense. 
My system uses fiber optic cables. These go all the way to the dac (MSB). Thus no emi or rfi is arriving at the dac. On top of this, MSB allows me to check if I receive bit perfection files or not. I do. 
So I claim that: if your dac receives a bit perfect signal and it is connected via fiber optic, anything prior to the conversion to fiber optic (streamers, switches, their power supplies, cables etc) make absolutely no difference. Your signal can’t be improved by any of these expensive pieces of equipment. 
If anyone can help explain why this is incorrect I would greatly appreciate it. Dac makers mostly agree, makers of streamers have told me scientific things such as “our other customers can hear the difference” (after extensive double blind testing has resulted to no difference being perceived) and my favorite “bit perfect doesn’t exist, when you hear our equipment tou forget about electronics and love the music”!
mihalis
mihalis OP
61 posts
 
Some clarifications
1) the fiber optic cable is what carries the signal. This provides even greater isolation than a cat cable, in fact as far as I know perfect isolation
2) the double blind tests included four people not just myself including a dealer who had to admit the lack of any difference

Someone referred to blanket statements not being helpful. I am not making any such statements. I am making a hypothesis, I test it, and I ask the community here to help with additional knowledge. 
My thanks to those who have responded on the topic.
mihalis OP
61 posts
 
Jdt1, why are a b tests becoming irrelevant? Any of us who have read o toole’s book consider his work to be seminal in helping understand real differences but is there something more recent that suggests a b tests if properly conducted include bias? Thank you.
mihalis OP
61 posts
 
yyzsantabarbara from what I can tell this would be a good choice and a less expensive way to get bit perfect signals. If the dac is equiped for it the cost is minimal and one can run very long fiber optic cables. If the dac can’t I have read of people buy converters back to usb right before the dac and again get great results with a very short usb cable in the end. M. 
mihalis OP
61 posts
 
Hi Welcher. My understanding is that Ethernet sends in packets but since it is still an electrical signal it is possible it would affect sound although a well designed interface is unlikely to. Usb connections are proven to make a difference good or bad with measurements. 
mihalis OP
61 posts
 
One designer of streamers confirmed that his effort is to reduce any emissions via air, cable and power. My “strawman” above addressed cable. I don’t know about air especially since fiber allows us to move the streamers or NUC as much as a kilometer away! About power however I get the point. That could have an effect. The way I may have indirectly dealt with it is that I run the custom nuc with a linear power supply (150$ from China!) and I always isolate my front end (other than the nuc) with isoclean or balanced transformers. M. 
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