While I agree with you about amplification and sensitive IEMs, many people prefer a nicer DAC than whatever is in their phone or tablet.
But beyond preferences, it’s kind of a necessity.
It’s 2019. Fewer and fewer mobile devices have 3.5mm ports. The standard has completely disappeared from Apple products, and it’s being phased out among Androids as well. So it’s either use a Lightning/USB-to-3.5mm adapator (all of which feature worse DACs than whatever is in the device), or use a small standalone DAC/amp... Like the Dragonfly.
But again, only if it can get quiet enough.
Can anyone who’s listened to the Cobalt confirm if the volume issue has been addressed?