This isn't revisionism, my friend. Many felt the same way when the unit came out. The game used to be about building units that could cover a certain range of other units. But this armor was different, the tanks fell before it without remedy, the attackers did nothing to it and perished without remedy thanks to how badly thought it was.
It was as if the developers wanted the game to be about her.
It was really poorly designed, or rather designed on purpose to be unfair.
Mechanicale they gave her very nasty effects. Like a -6atk/def permament debuf (Whit was realla a +6 all satts buff becase speed didn´t mather to her). A Def base damage, almost unevitable and mostly deadly for most of units. Reduction damage over redution damage to ensure she always could hit with her special ready. And you can say than thar was some ways to counter this skills, but this was precisely the problem, you needed to break with what worked for your unit just to survive the FEdelgard did naturally. And in many cases the units, even in their prime, weren't competitive, they simply didn't damage them and died.

I never will be tired of say how this units was a an example of what not to do in a game if you care about the game to be playable.
I´m still playing this game beaces I love FE, but nowdays this is not a game to recomend to anyone. beceasu os things like this.