Quite plausibly they just didn't realize how rocky the start would be, or perhaps they valued that immediate strategic autonomy more in the short-term that we think, and willingly chose to take the hit to their reputation rather than wait.
Regardless, they had choices.
> They could have launched a submarine non-apple-branded product to test the waters.
This is a great idea. Are there any past Apple (or non-Apple) examples of this product release strategy?