When you have a 1h+ shield equipped, you lose the ability to press Blades of Justice and Templar’s Verdict, however you can still play around with JV and SotR for some casual fun.
Lvladen has a video of using it in some BGs, and I’m sure LFR/Mythic+ 1-6 wouldn’t be the end of the world if you wanna just play around with it.