Out of curiosity I searched for some sort of explanation why people are so obsessed with row based deplaning, maybe thinking they are polite which they are not, or they enjoy being trapped on the plane as long as possible?
While in other situations you won't step out into someone's way since it would be rude people do it all the time when deplaning. A person in the aisle ready to move forward is blocked by someone just standing up into their way, and pulling their suitcase down, blocking the whole aisle.
Or I witnessed this one - a guy standing in the aisle letting an older lady sitting at the window stand up and go, it would take him one second to make a step, but he decides to block everyone behind him because he thinks he's being polite. The lady first refused but he motioned her again so one second turned into a while, for about 100 passengers. If you block the aisle, you are slowing everyone including yourself.
Then I came across this old forum where people furiously defend deplaning by row, the dummy deplaning.
https://community.ricksteves.com/travel-forum/transportation/the-etiquette-of-deplaning
In one comment where Margie boasted her 6'4 husband blocked everyone so that front rows could deplane first.
Margie, your husband tries to educate others while he's the one to be educated, no matter how tall he is. And he is probably not an airline employee either to impose any rules. What do you think makes you right to block others who are ready to deplane?
The basic common sense is if someone in the aisle is exiting you let them go and sit until the aisle is vacant next to you. Pretty simple and cuts down the time to deplane at least half. Try it next time you fly.