Overall ARMs decisions with the A73 make a lot of sense. ARM's big cores definitely needed to improve in terms of power and efficiency. A72 was a first step towards that goal and A73 further improves in that regard. In the future we should expect ARM to eventually again return to wider microarchitectures as we hit the wall of diminishing returns in terms of frequency scaling. HiSilicon's Kirin 950 was a game-changer in terms of perception and analysis of ARMs microarchitectures as we finally have a vendor that was able to hit power figures near those that ARM publishes, lending the latter much more credibility when talking about efficiency goals.
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All in all, Im pretty happy with the direction ARM went with in the A73. It addresses a lot of the issues brought up in the introduction, and while more performance is always wanted, efficiency needed to be in focus this generation, and efficiency we got.