I'll be honest and I say this as a Fire Emblem fan, the discourse around the series gives Paper Mario discourse a run for its money and the ultra hardcore Fire Emblem fanbase might be one of the worst subgroups in the entire Nintendo fandom. And it's kind of been that way since the 2000s when the series made its international debut. I can remember a time when some people were saying that Sacred Stones was going against what the series stood for. And don't get me started on Fire Emblem Heroes Youtubers. There is a certain percentage of the fandom that can only praise a Fire Emblem if they are talking shit about another Fire Emblem game. There's a persistent sense of victimhood, for lack of a better term, among some fans who that Nintendo and Intelligent Systems are actively trying to destroy the series they supposedly love. This leads to obsessive behavior without being able to move on with their lives.
Not that this behavior is exclusive to within the Fire Emblem series but because of its relatively smaller fanbase compared to other Nintendo franchises, negativity feels more pervasive. For example, it could be hard to find good Youtube content on the series because there's only a select number of Youtubers that focus on the series compared to something like Mario or Zelda and unfortunately a lot of these Youtubers focus on being negative.
The series is in the healthiest spot its ever been. The series is constantly changing things up so if one Fire Emblem game isn't your favorite, there's a high chance that the next one will try something new that you might like. But so much of the discourse just focuses on how this game or that game has ruined the series forever.
Sorry for the rant.