Have you had all these said DACs in your system at the same time with the ability to switch back to each using the same source material.
Certainly not. But my the original Dragonfly, DFy Black, DFly Red, Gustard A20H, Marantz SA8005, Brooklyn DAC+, SBox Duets, SBox Touch etc. that I do have on hand certainly do not sound "basically the same" as you say.
I'd guess that DACs <$5K sound more different than those >$5K.
To say that the worst $25 DAC you can get sounds "basically the same" as say a $3500 Exasound is simply preposterous.
If what you are trying to say is "I'm so rich that I can't even participate in the kind of thoughts that you poor people have" then yes your point is well made.