To make a short answer of a long question.
I think handlebar width - whether road racer, rando, tourer, etc - is a personal preference. (assuming your bags and electronics fit)
I think handlebar shape for long distance riders can be important. Some very new handlebars allow support for wrists and lower forearms, not sure if they are proprietary designs on new bikes. The UCI's rule on prohibited positions in the Pro peloton is what brought 2 new style handlebars to my attention - I have not seen them in use.
I did a 'short and shallow' handlebar swap that improved the ride on one bike. And I went narrower.
And a new build will feature very narrow bars with a flared drop position.
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Vintage, modern, e-road. It is a big cycling universe.
Last edited by Wildwood; 06-01-22 at 09:53 PM.