1. This is the sound Science forum, not the "What bigshot hears, experiences or is concerned about" forum. If it were that forum, how would it be any different to any of the other forums here?
2. Define "significant" and of course, don't just define it for yourself!
For example, DAC "A" has a noise floor of -100dB and DAC "B" has a noise floor of -120dB. DAC "B" has a significantly lower noise floor, in fact an order of magnitude lower but under any reasonable listening conditions even DAC A's noise floor is inaudible and therefore the difference isn't significant in practical use, it's irrelevant. But what if the noise floor were say -60dB and were audible under some reasonable listening conditions, would it be significant then? In other words, would it be "insignificant" if you personally can't hear it with your reasonable listening conditions but others could with theirs? Unless you've got some reliable evidence that it's always inaudible under reasonable listening conditions, you don't get to define what's "significant" for everyone else, this isn't the "bigshot" forum!
Again, you're doing exactly what so many audiophiles do here and that you criticise them for! IE. Not just making assertions of fact which are actually just personal opinions/impressions/experiences but then endlessly defending and repeating those personal experiences/opinions using different wording but still NO reliable supporting evidence. And, also exactly like the audiophiles you criticise, you seem completely oblivious to the fact that each new reworded repetition does NOT defend your assertion, it does the exact opposite and just makes the hole you've dug for yourself even deeper! How do you not see this?
G