Why use wide mouth jars? It seems that

wide mouth jars are easier to drink from, hence that's what we mostly have at our house....

And my fat little hands won't fit inside a regular mouth jar to wash them.....

Less air space to oxidize in a narrow mouth.

I like wide mouth for meat, it comes out easier.

Most of my bwb mayo jars are wide mouth.

Everything else regular mouth.

Definitely for meat, and beans. Even with a dishwasher, I want to be able to get my hand down in there to clean after meat or beans. I also canned peach halves this week and some of them were so large that I had to squish them into a wide mouth!