See the thing is HH I have been hit by a motorist making a left turn... at a quiet residential intersection, that had no obstructions, no fast traffic, no confusing background and no bike lanes. I was properly positioned and I came to a proper stop.
The motorist did nothing to indicate they were making a left turn. Nor was their anything in their lane position to indicate such. But apparently I was fully invisible to the motorist, inspite of our only 30 feet or so of separation... and what appeared to be eye contact. That tells me that the motorist did NOT do everything in their capacity to ensure that their way was clear... and I see the same thing every time I ride a bike OR drive.
A simple thing like learning to "look twice" would save lives... but motorists generally do not do this... because "it takes another second." It is not a matter of "remembering" but of making a simple technique like "look twice" a habit.
Gets right back to the very defensive techniques you often mention.
Look Twice.