DAC question - is music streamer DAC better than mcintosh DA2?

I am planning to buy a MA12000 or MA9500 or MA8950, all of which have the new DAC (DA2) along with a music streamer. While I perusing the posts here, I see that several of you have suggested not to rely on the mcintosh's DA2 and instead, rely only on the music streamer's DAC. If that is true indeed, then what is the point of spending thousands of $$$$$ on a mcintosh? wouldn't a more reasonable (price-wise) manufacturer suffice? 

What are the other considerations for me to understand? Thank you :)