Sure, more information is good, but you shouldn't expect that information. People don't use DRLs and turn signals all the time. Lights break. Electrical connections degrade. Old cars almost never keep up with advancements in signaling technology.

All the signals in the world wouldn't help people deal with someone that refuses to use their indicators or doesn't maintain their old car, and that is the expectation you should have when driving: the worst possible drivers around you all the time.

You can deal with practically any situation as long as you're keeping your distance and staying observant. Regardless what the people around you are or are not doing.

Agreed. Fully.

And yet precisely none of that, to me at least, is persuasive reason to NOT put the most effective possible light and information on cars coming out of the factory :-)

(And don't even get me started on red vs amber rear turning signals ;)