Yarn made the same mistake going from 1 to 2 as Angular did. The newer version was so different. Both should have been named something else. At a certain point of incompatibility and divergence it is a different product, and the benefit you get from using a well known name is outweighed but the cost of confusion.

Yarn 2 brought a lot of great improvements but since it was named "Yarn" people were expecting it to behave somewhat like the first one.