Since when was Morrigan an excellent, well, anything? Her value came from exclusive knowledge and unconventional magics given to her by Flemeth.
Politically, socially, emotionally, she was hardly anything remarkable.
Because people (in-universe and out) disagree that she was making substantial improvements.
Celene's reforms were often nice-sounding but pretty minor and superficial. They could be things with long-term benefits... or not. Without successes to point at, 'change' is not reform. Systemic reform, especially with regards to things like elven policy, were limited at best, while Celene's policies were also unsatisfactory by other accounts.
The elves see that Celene razed an alienage. Her closest confidants and rivals know that she wouldn't keep her promises and agreements. Her military aristocracy lacked confidence that she was even interested in reversing the defeats of her predecessors.
Who, exactly, is supposed to point to Celene as the beneficial influence on their lives or for the country?
Not sure if you forgot but there is a war going on with mages and templar, there is also a breach in the sky with demons. I say Morrigan knowledge is highly valuable at this point of time. Maybe she was not the best at social parties in DA:O but with time she would learn what she needed, Morrigan excel at surviving.
The book only covers part of Celene reign, maybe people should not forget that. A reform is suppose to be a gradual thing, you do not see big changes like a radical movement. IRL how much time to you think it takes to change a culture mentally, 20 years?
Also there are even evidences of her support of Justinia V in favor of the mages. There is also a talk with Celene and Leliana about rumors of her elven favoritism. About her minor polices to help elves and others, I really do not see where did you got that. Can you source in the book what were her polices during her reign? The only thing there, is this.
In recent years Celene has been strongly encouraging the university to overlook the lack of status & rank for certain individuals who show prodigious talent or potential which could help further the interests and prestige of the Orlesian Empire, provided a noble sponsors them. Most recently this has even extended to Celene personally interceding in support an elven math prodigy, Lennan, who was sponsored by Comtesse Helene.
I really doubt that is all of it, If Celene and Briala were doing nothing major to help the elven people over the years, why would that even affect the stability of Orlais. All of this things are in the book but reforms can fail too of course.
If you read my other posts in this topic, I said that I believe that the elven people future is not with the humans, Celene intentions to help them ended in Halamshiral and my vote goes to Briala.
You make them sound like they're incompatible.
Progressive imperialism, like liberal interventionism, is totally a thing.
The problem with that is that Gaspard stated in the book that he wants to invade other countries to unit Orlais and not to illuminated others with his country ideals. Actually Gaspard could be a lot better than Celene if it was not for his damn chevalier honor. He was trained by the same people in the Game and was good at it. The situation in Halamshiral, the way he used a bard to do his dirty work and lure Michel way during the hunt.
Gaspard let his honor get in the way of doing what is needed, that is why Celene is still alive. Actually I changed my mind Celene and Gaspard are both incompetent assholes.