I'm ok with "the regime" selling my preferred attitude if the majority isn't clear. Wouldn't it be better for the nations of Thedas to explore the possibilities for coexistence first, and only go back on that idea after evidence shows it won't work? Surely co-existence is fundamentally desirable if it can be achieved, is it not? And don't mention Tevinter. I'd like to see co-existence attempted in a society without a prevailing acceptance of slavery.
By "selling", I meant that the regime attempts to convince the population of what they wish to be reality so that they live under the impression that it is reality and thus act in accordance to it. Basically, repetition of ideas.
For instance, attempting to isolate political opponents by propagating the idea that they are unpopular or that voting for them is wrong by using loaded words that have been associated with negative things which themselves are negative because it works against the interests of the "elites".
If your ideas happen to coincide with theirs, good for you. In this particular case, co-existence may be desirable but we have no reason to believe it is possible. The only example may be the Avvar but their society is primitive and we have seen far too few.
I for one, believe that Drasanil's arguments are far more convincing that one DLC.
As for the other thing being a loaded discussion, not for me. I'm not emotionally invested in either side, though I do have a preference, basically because I don't see the point of the other side. Also, we live in different countries.
Unless I am not remembering it correctly from the glory days of the Miranda fan thread, you are German.
our societies have become plutocracies in all but name, but so far it has managed to keep the peace.
Indeed they have. And magic is a very useful tool in the accumulation of wealth and thus power.
Imagine if Thedas has 21st century technology which was entirely based upon magic.
Sure, it would have a better standard of life than Thedas currently but mages would hold all the power which brings us to two different points on question 2 of your OP.
First. we have the obvious bias towards one own's group. In Orlais, Chevaliers have absolute power over the common man. Therefore, you are right to question how this is any different from a Magister.
However, in Orlais, mages are kept separated from the population so they can't hurt them. And the same is true in Ferelden, Anderfels, Antiva, possibly Nevarra. So wherever normals rule.
On the other hand, in Tevinter, the Dalish and Rivain, where mages rule, the mechanisms accounting for the possibility of an Abomination are, literally, just "deal with it".
Hence, a visible way in which who rules ends up positively or negatively affecting the people, even if both mages and normals ruler can be egotistical, entitled, selfish, etc.
Second, there is the matter of independence. Now, this is a more complicated matter for what it means to be independent varies from person to person.
Since I have seen you use the word subservience in a negative context, I can only assume you believe in independence.
A way in which it manifests is to be ruled by one's own kind. For instance, both Ferelden's Rebellion and the mage's had this goal.
Therefore, on principle alone, one may oppose a magocracy if imposed upon normal people. I certainly do.