Not really, those are all pretty practical examples. I've dealt with each and every one of those.
> Americans with wrenches tend to have both SAE and metric sizes.
The metric ones will be brand new if they have them, the imperial ones will be well worn.
> The thread pitches of metric bolts differs from SAE standards
Indeed they do. In the EU Ford vehicles are all metric unless they were private imports from the USA. I'm not sure what the situation is today but when I still lived in Canada the ford we had had all imperial sizes bolts as far as they were exposed.
> Tape measures have standard units because they're standard where tape measures are used - in construction.
Yes, and as long as you don't change that that's they way it will stay. The English drive on the left because they do. But that doesn't mean they can say that they've adopted driving on the right side of the road because they could. They haven't. So construction is almost entirely in Imperial.
In a metric country, metric is used everywhere, because it makes sense.