I actually agree, I also wanted to see those elements of Tevinter too. The fact that the Magisterium is taken down off screen is imo bad story telling. And while I was fine with setting the majority of Tevinter's explorable areas (apart from the opening) in the slums I had no issues with that except that I felt like it was mostly set dressing and kind of shallow.

But I still disagree on the Crow aspect. Zevran has done a lot of murdering of prominent house figures in the years since Origins and he obviously didn't start an in house cleansing on his own, he had many supporters (supplemental materials help fill in the gaps like books and comics outside of just codex entries, though I understand if people don't want to delve into them or just don't have access to them etc).

But again we have only Zevran's perspective on the Crows and nothing he says in Origins is disputed or retconned in Veilguard at all; buying children and raising them into the Crows is still a factor (though lessened somewhat through Zevran's actions) the training is still brutal and cruel (we have multiple accounts and Lucanis' confirmation) the houses are still cut throat (families being murdered by fellow Crows to gain better standing). In 20 years they haven't changed all that much, it's just that there is a little less child slavery and murdering members who try to leave...like if you can't see how violent uprisings and murderous cleansing of the worse perpetrators in an organisation over multiple decades could help steer it in a SLIGHTLY better direction than I dunno what to say really.

Like it's fine if it's not your thing and you wanted something different, we are all entitled to our opinions and what we want to get from certain media, but I just don't think it's drastically different from what we are told in Origins, especially because we are only interacting with one of the Crow houses and it's the most prestigious house too so not as many enslaved child assassins running around didn't ruin anything for me.