In my opinion, there are few things that made the outcry a lot different for two companies.
The timing, when Firedorn Saga happened, few people outside GG cared about SJWs and almost everyones reaction was "Its just a stupid poem, noone cares.". On the other hand Mizhena Saga comes at the time when there are a lot more people tired with the whole SJW bullshit, with the latest being the Overwatch ass controversy.
Reaction of Obsidian was done much better, instead of attacking or mocking their fans they simply shifted the blame from themselves and said it was authors decision to change and that they also didnt want to change it. I personally think thats bullshit but it was enough for majority of their fans.
Fans, while majority of Obsidian fans are long time followers who are willing to forgive companies mistakes as long they provide them with the games they will enjoy. Beamdog fans are not really their fans but fans of BG, and Beamdog already had a shaky relationship with them due poor releases of EE editions, inserting SJW politics was only the last drop that lead to outrage.
Personally I think Firedorn Saga is far greater wrongdoing. Obsidian shit on their fans due a complain of a random nutjob and for what, a shitty poem no sane person cared about.
As for Mizhena, I dont care about people putting trannies in games or preaching about values of diversity or any other SJW bullshit. Im all for freedom of speech and artistic freedom, if its your game you are free to do anything you want with it. So Im all for that SJW nonsense to stay in the game, but that wont stop me from saying its retarded, saying its poorly written and forced, and that I will not be buying it.