Good point.
But still... we don't know how bad they really were.
Were they like kings and queens? Someone telling you want to do isn't always "evil" - so Evanuris who are imperious protectors of the elven civiliation don't necessarily have to be tyrants just because some elves are inconvenienced by work...
I mean, we are told the elves had royalty I believe... are these just the favored? Or did the Evanuris keep their distance?
We know nothing but what Solas claims - and I believe nothing he says on his word alone.
Honestly I don't know how the rest of their society was working.
They had a fervous priestwood like the Sentinels , and again it seems those were fighters .
From Mythal temple we know at least for her , it wasn't a simple vow of worship they were bound to her by magic.
There's a Fen Harel tale talking about a King , and Felassan talked about nobility and you could find noble tombs working a bit like Mythal temples.People had to walk some path and they could ask for some advice from the Dreamers.
What I find strange is why the nobles were going in uthenera because they were "tired" of living but you know the Evanuris were never tired of ruling everyone.
So I wonder if there were some purge system in place , and people were forced to "retire" through death for common folks and in uthenera for nobles .
About the Evanuris being "evil" I said for us they would be monsters , but for their times?
They had a society where part of the population could in theory turn into a dragon.
If you like your buildings and your fields and your social order , you might want to keep the people from using a bit too much magic.
I think they might have run into complication building an empire in Thedas , an "immutable" plane (more or less anyway) with so much fade magic at their fingertips.
The Evanuris may have been casual about their own power of destruction but I have a feeling they weren't willing to extend the courtesy to others.Which might have been the right idea.
Still I have a hard time saying slavery religious propaganda and piles of dead bodies were grand.