Your summary is spot on.
Until I have seen empirical evidence in the form of battery graphics with and without dictation on, all ither factors identical, then the link between ‘the wheel’ and battery consumption is not proven.
Yes Apple make some of the best hardware on the market, Samsung and Huawei are catching up
You just need to buy into the fact that increased security and being able to use the same ios on all models from iphone 6S to 12 without performance loss sometimes has glitches. Important ones get ironed out quickly, cosmetic ones do eventually.