I've long described the tyranny of Aspect Ratio

And now, two well known Youtubers have made interesting videos on the topic.

Tony Northrup gets dangerous with his scissors

And Craig shows some magnificent crops

By the way, my Olympus cameras tend to offer 4:3 (no crop), 3:2, 16:9, 1:1

My Sony A7 only offers 3:2 (no crop) and 16:9 even though it is mirrorless and the LCD / EVF could easily cope with showing different crops