HDCD was a similar technology applied to physical CDs, where the native sample rate had a fixed limit. I believe MQA is similar, but used for streaming, where the potential signal bandwidth continues to increase. If you have a high speed Internet connection and local network bandwidth, you don't need or want MQA. However, if your stream to DAC is bandwidth limited, it may be of value to you. Over time, though, the audience for processing such as MQA grows more limited, just like HDCD was effectively superseded by SACD (which is also heading towards obsolescence due to high rez streaming)
The OP comes across more as prejudiced than informed. Buggy whips weren't proven ineffective or fraudulent, they just weren't needed for cars.
PS FLAC is a compressed file format. It needs to be rendered back to its original state (wav for audio files) to be converted to analog. This capability can be built into a DAC.