Explained above. Most have never experienced great sound so even if there's even better sound, they're unaware. This sets a new bar for them and will blow them away.
This is exactly how Bose has been successful at selling their systems with their stores (spare us the audiophile complaints about Bose being crap). The average person has no idea music or movies can sound better. They wander into a Bose store at the mall and they're blown away that with decent speakers, these things can sound better. They walk out with a thousand dollars in speakers to improve their home audio experience. Apple will sell in the same way.
Even though it's not hi-fi audio, it's still a lot better than what the average users is use to. That'll sell.
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Those guys just look for any reason to slam a product that costs less than $1,000. Why in the world would you give your product to someone you know is going to slam it no matter what?
In addition, the people those sites appeal to are NOT Apple's intended audience. The people that read audio blogs aren't interested in the HomePod and have already made up their minds not to like it or buy it, no matter how good it sounds. Again, there's no point in marketing to them.
There is nothing to be gained, which is why Apple hasn't bothered.