Yep, you are absolutely right.
Digital cannot go wrong. File I/O is RAM buffered. CRC corrections don't introduce jitter or noise. 44.1KHz is more than enough, there is no aliasing from digital/analog filtering. Human kind already knows everything about Digital audio, the sampling theorem and thus everything in digital audio must be working perfectly as God intended. DAP Engineers already perfected the EMI shielding of electrical signals that runs through the audio circuity, there is NO WAY for microsd electrical noise and interference to affect the audio output.
Are you happy now?
To add some background as to why I have certain beliefs, they are what I have learned from 30+ years of troubleshooting Telephone Switching systems.
- Single point grounding systems are necessary - had to switch all the equipment to this, as uncontrolled grounding caused synchronization problems
- Noise feeding through signal and ground plane/leads. The only way to get rid of noise is to prevent it at the source. Nothing else works.
- A faulty 1.2V ripple from a single power supply locking up distributed processors in 5 x 4' x 1' x 8' equipment bays. The massive errors caused a total lockup of all the controllers.
- How overload affects processors and resources, and how to keep equipment operating under maximum load for extended durations.
- Experiences in home audio with how lowering noise/improved grounding reduces a parasitic signal using up current in an amplifier, and how reducing the noise "opens up" the sound, due to more power being available. Most easily observed in improvements in bass and micro details.
Thus my focus on noise and grounding, from real life experiences with how and why equipment fails. And how pernicious bad noise and grounding is.
And why reducing noise, anywhere in the signal chain, always has a benefit to SQ.
And for those people who do not believe in SD cards, cables, sources, etc, there is actually no conflict. Those people are already happy, and nobody is trying to convert them.
There are audio communities for all different beliefs, so each can enjoy their own beliefs with their own kindred spirits.