I've been playing this and have a bit of a spicy hot take about it: I know lots of people like to crap on this game for being vastly inferior to many other later games in the series. It's maps are simple, you don't have conveniences like easily checking enemy ranges, damage forecast, etc.
I think if it actually was localized back when it came out, opinions would be a lot different on it and more like Super Mario Bros. 1. Super Mario Bros. is a weird example, just because FE is a more complicated game by nature, but SMB1 has a lot of things that wouldn't appear until later games that are just synonymous with the series now. You couldn't scroll the screen left, jump momentum is a bit weird, and vastly different from later games in the series, you couldn't do things like picking up koopa shells, none of the levels had any verticality to them, so on and so forth.
There's nothing WRONG with SMB1, and in fact it's an excellent game, it's just very simple compared to it's successors. Fire Emblem is the same situation. So far based on the 3-4 maps I have played, they're very simple: Beat the commander, take the castle. There's villages you want Marth to get to. There might be enemies you can recruit, there's houses to visit that tell you about the game's mechanics, there's usually a shop and a convoy. There's no weapon triangle, but still things like bows > fliers. I know the later maps obviously get tougher. Things like castle maps with chests get thrown in, but you don't have a lot of the more complex stuff you get in later games in the series.
If you ask people which 2D Mario is their favorite, you'll get a variety of answers. The most common ones I see are SMB3, SMW, and NSMBU. I almost never see anyone claim that SMB1 is their favorite, yet everyone universally thinks it's a great game.
If Fire Emblem released in 1990 in English (or 1991, given how long localization could take), I think this game would be seen a whole lot differently by English-speaking audiences today. You CAN go the method of doing the damage calculations yourself, but given how simple everything is in this game, I have mostly winged it through the maps. Granted this could change later on, and I might take advantage of the rewind more, but I've been doing generally pretty okay without running the calculations. It's been more a glance at my stats and their stats, and seeing if it's a fight I could reasonably take.