Maybe it's naive of me, but I would assume it won't take 6 years for Apple to redo the work that Google is ahead on. For one thing, they now know a specific feature to work toward, which cuts some time out. Then, they can likely throw more cycles at this problem than Google could 6 years ago, again reducing Google's lead. Lastly, they probably have a lot of stored raw data (satellite images specifically) that Google didn't have at the start and took time to collect multiple angles over time.
I think you're confusing ideas/features with execution. Apple knew very well at the onset what to build. But they executed poorly and underestimated the amount of non-trivial human involvement in correcting mistakes and combining many layers of information into a cohesive and [mostly] robust experience.
These kinds of applications aren't Apple's strong suit, and Google is years ahead on technical abilities on the data correction and feedback front as well as custom satellite hardware and software design. Although Apple may be moving on that [1].
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