Do you need a DAC with the silly MQA thing? Or do you want to move the streaming to a stand alone DAP instead?
I don't know, LOL. Being new to digital, everything I have read indicates that the sound cards on computers are limited without a DAC. Since my tower has some years on it, I would think that is especially the case.
I haven't thought about your second question to be honest. The vast majority of my home music listening the past decade has been straight turntable to IA. So the digital age is rather new to me believe it or not. My Tidal experience thus far has been mainly via my cell phone to ear buds.
Long and short, I am moving my IA from the living room to my home office, and wish to replace my turntable with online music streaming via speakers, for an indefinite period of time.