New Sejauni is actually looking really cool despite complaints of thematic

Complaints of which I really didn't understand in the first place. The thematic here is mounted warlord. I see nothing out of place here. Her new E looks like it'll feel as if she's running through multiple targets, freezing them and bursting a large portion of their health before moving on to the next target and letting her band of warriors behind her finish the job. W and R let her chase down those fleeing foes and continue the conquest, leaving a hapless freezing opponent for her allies with each Permafrost.

And thematic aside she looks like she gets to "play" alot more now. The new passive, W, E and R all look really fun to use and much more defining than before as well as much more interesting to play against with the new minigames of breaking her armor, dodging max range R's rather than a point blank stun, avoiding W 2's increased damage and Permafrost stack. It just all looks great and I'm all for this.

As for numbers I could care less, as long as the kit is interesting and fun to use. Numbers can change with small edits anyway. But the way it looks now it seems her job is to jump in with extreme temporary tankiness from her passive to deal ~40% of each target's health and keep them locked down for her team to finish. That sees absolutely accurate for a rush-down focused tank.

This is just my opinion though and you're entitled to each of your own, but this is definitely something I can back 100%.