As long as you balance everything around flinch.
As Zircon had 0 flinch and spells etc will have been balanced around that I assume, (also stuff like dance of swallows will be all that much stronger - gap closer and flinch)
Personally the lack of flinch made Mir3 more interesting for me (as I am so used to mir 2 and flinching everywhere) - took awhile to get used to, but was also alright