You dont have to play champions to understand them, that ideology will get you nowhere. Balance =/=not important. But also what people WANT =/= unimportant.
Please then, impart your vast knowledge about Sejuani onto me. Tell me some things that I, the Sejuani main with over 1000 games on old Sej and already 34 games on new Sej don't know. Tell me how Riot made her more healthy. I can tell you exactly why they didn't, infact I've been saying it all throughout this thread if you'd stop to read for a second. Expertise grants knowledge, moreso than anything else.
Also where do you think your ideology gets you? Balance above all else? Come flip a coin with me. Perfectly balanced, no actual gameplay. At least my philosophy taken to an extreme gets you a potentially quite fun game even if it's not balanced.
The only thing that is important is overall healthiness in the new kit. You know what, people might not like the new changes, does that make them bad? NO. As much as it sucks to say it, if you like something that was changed, for the only reason of unhealthiness, you either accept the changes, or find something else to like. How is feels to play is almost irrelevant. You might not like new Sejuani, but i guarantee she'll find new mains.
Oh the game health argument. It's not like that's been refuted a million times. New Sej is far less healthy to play against as well. Her E creates some frankly abysmal situations. Sejuani can land a point and click 2 second stun after doing literally no work just because a bruiser gets on top of you, then she can nuke you for 20% or even 40% at a range. She has some abysmal play patterns, I didn't even need to play her to see this, but playing her has certainly confirmed it.
And that covers how it FEELS to play but what about how it feels to play AGAINST? Well i can damn say its too early to tell.
What world do you live in? There's people who have 20+ games against Sej, but even personally after playing 6 or 7 VS her I can say that her game patterns, not just balance are complete cancer.
I dont feel SIGNIFICANCE in a difference in unfairness.
Based on everything I've seen, the community would disagree.
And the actual kit itself still has similar strengths and weaknesses than before.
Just no. Old Sej was a top tier teamfighter and effectively the hypercarry amongst tanks. New Sej spikes at around 9, she's optimally played in either small skirmishes or even just as a solo splitpusher from the top lane. She has limited DPS where she used to have a lot, and now she has insane burst. She's nothing like old Sej in terms of strengths and weaknesses.
overall healthiness
I love worthless buzzwords.