When i got a Nissan 350Z back in late 2003, I found the blind spots in the rear corners were massive. I ended up having to adopt
Avoiding The Blind Spot of basically pointing my outside mirrors outwards. It took awhile to get used to but now I do it on ALL my cars and on an car I drive (e.g. rentals, test drive, parent's car, etc.), regardless of whether they have blind spot warnings.
Of all the cars I've owned or leased, only my '19 Bolt has blind spot warnings (
yellow lights on the mirrors).
In high school driver's ed (decades ago for me), the instructor used the acronym SMOG (signal, mirrors, over-the-shoulder, go). Back then, I don't think any cars had BSW.