The $9 official headphone dongle is a superior DAC to most audiophile products and has a bigger R&D budget than that entire industry. Same goes for Google’s USBC dongle.
https://www.audiosciencereview.com/forum/index.php?threads/r...
You can still carry around an amp if you have very power hungry headphones though. Personally, I don’t think I could ABX lossy audio while outside dodging cars in the crosswalk.