Please explain how a laptop is "dirty"??? If you are bypassing the laptop internal DAC and hooking it up to what have you external DAC then all the laptop is doing is sending a stream from wherever to the DAC of your choice. Why on earth you would need to buy a blue sound node or any other streamer is beyond me, when you can just use laptop, ipod, iPad etc....
I find this incredible.
Tantamount to horning in on the analogue thread with “tell me why I should spend $150 on a turntable cartridge when my wife’s old stiletto heeled shoe strapped to a playground teeter-totter makes my records sound just fine”.
If your ears can’t recognize bad sound that’s unfortunate: but, that’s not your problem is it.