if I was into streaming I think I would do the same, unless your broadband is so slow you need to receive the files in a compressed lossy format.The hardware part of MQA isn't very spectacular.
If the DAC reads the watermark embedded in the MQA file, it will apply minimum phase filtering and upsampling.
Your Marantz probably up-samples as well and employ some kind of filtering anyway.
Personally I'm not willing to invest to be able to listen to a lossy file format.
I rather switch to a streaming services delivering hires unaltered.