You can earn titles from Solo rated bgs right now!

[Mondheul-thrall]

There’s no active season presently, so you can’t buy Season 4 gear with 1400+ Rating.

Rated Battleground Blitz Does Not Count Towards Challenging Artifact Appearance - Support / Bug Report - World of Warcraft Forums (blizzard.com)

Would like them to make my artifact appearance obtainable by solo rbg blitz