The sound quality of streamers only depends upon the analog conversion, which at this point is standardized and audibly perfected. And as a former software engineer, I understand that the rest of the hype is just marketing nonsense sold to the uninformed or those suffering from what psychologists call "belief perseverance." So save your money
You offer encouragement and a way to achieve a very affordable entry point for audio streaming. I’m sure that the OP is grateful for this. And if one decides never to venture beyond this initial stage and they enjoy what they hear, that’s a wonderful outcome. Enjoyable and very affordable streaming in your home.
Beyond that however I believe that your further comments are misguided (Although I do not doubt the good intentions). There have simply been a huge number of people who have begun streaming at a modest level and subsequently moved upward in sound quality and performance. They are not delusional or gullible.
Multitudes have candidly shared their experiences of gaining significant improvement by purchasing better DACs and music servers/network players. It is unreasonable and irrational to believe all these folks are duped by clever suggestive marketing. Or to resort to the overused “confirmation bias” to explain why sonic improvement is heard.
I appreciate that you are a software engineer, that’s nice. There are people with equal and perhaps a broader and deeper technical experience and backgrounds (Than you) who can attest to the benefit of better equipment. Obviously you have every right to your convictions.
The OP may agree with you and that is his prerogative. To suggest that any digital audio system that goes above and beyond yours is wasteful of money and a foolish undertaking is exceptionally shortsighted and narrow. You have created a nice streaming set up that pleases you, good. But keep in mind that much better sound quality is obtainable if so desired.
Charles