High ranked players were REAL upset at her new mobility. Lower ranks where not so good at turning it living though attacks which should have killed you, But for sure the high ranked players were.
If you were keeping an eye on the twitter / streams, etc… there was a lot of complaining about it.
As for Blizzard not wanting to change DB, it is mostly because they don’t want the heroes to all becomes slight variants of each other.
Every time you see Blizzard changing things which are “not the problem” - it is because the problem is what makes the hero more unique.