The Plarium CMs posted an update that talks about the rebalances here: https://plarium.com/forum/en/raid-shadow-legends/843_news/20921_raid-digest--01-10-21/

Hellhades did talk about it, and got on the test server to run Urogrim through the same content he was soloing. HH says he can still solo everything, solos Dragon 25, and is "one of the best Epics you can pull." https://www.youtube.com/watch?v=Yc5gbKnwbwk 

I'm sorry you spent resources on him. I know one of the goals they've told us is that they intend on speeding up the rebalancing schedule for champs.

I've no idea what you're talking about with Armiger and Septimus - if your Armiger outperforms your Septimus, the gear on the latter must be pretty terrible. 

But as to your other questions, the short answer is: get used to it. They do some rebalances every once in a while, yes, though mostly just for legendaries and it's not and never will be the top priority, because they can make more money from new champions. Hard nerfs like this are very rare, I'd argue they should probaby happen more rather than less, but when a champion seems too good to be true like Urogrim was, you should know that there is some risk of a nerf, with no compensation because they're afraid of the precedent that would set. 

"with no compensation because they're afraid of the precedent that would set"

Actually, a possibility of "resetting" a nerfed champ to base stats, with a compensation of books/chikens - would be not that bad. For players and for Plarium too.

The new champs are better than the legacy champs for oned reason only - everyone will want them so a lot will spend on shards to get them, players who have been playing the game a long time will have originals - what do Plarium benefit by buffing them up to the same level as the new ones? - answer is nothing, and if any change in the game does not make money for them don't expect it to happen - even though they pay lipservice by occasional buffs - Pyxanel for example, buffed and still totally useless

I think you are giving plarium a bit of a free pass here.

People told plarium the champ was overtuned before it was released, that was the point at which it should be nerfed. They rake in such a massive amount of money that they should playtest things properly. Other champs have been nerfed before release and no-one got upset.

They dont have to refund anything, the TOS make that clear. However other publisher such as blizzard  -have a system where you can recover wasted resources when doing a hard nerf. It is real money people are spending and plarium items are ridiculously expensive.

There's a big difference between giving them a free pass or being used to their shady business practices and realizing they're not going to change. ;) I said 'get used to it', not that there wasn't anything wrong with it. 

Among real video game manufacturers, nobody would dare treat their players remotely as badly, but this is the gacha market, fleecing players for as much money as possible with morally dubious, barely legal practices is pretty standard. And even among gacha game companies, Plarium stands out for rarely if ever awarding compensation for the things they screw up - other companies may be just as predatory with their prices and marketing approach, but will at least provide compensation on a regular basis. 

I cant argue with any of that :)