Just making sure you are aware, majority of the complaints I think you have, is due to the fact this is adopting an old game for modern audience without completely ruining the first game.
Yeah I haven't played or even seen the original NES version, so I wouldn't know what's stayed the same or changed between it and Echoes. I would assume the watered down pair up system is new though.
Out of curiosity, have you played any FE before awakening? Because i disagree.
I dislike the class changing and skill inheritance of awakening and Fates, wich i consider a humongous grind, wich the older games didn't have particularly because who they were and their class made them fit as part of the world and didn't force you to grind with multiple units to get the "perfect" setup. It forced you to build strategies with the resources you had. Also, little to no backtracking was a staple of the series i wish to see back, because FE used to be a story driven fest and not a grind and breeding fest. It completely ruins the pace.
Pair up was never very cool to me and just exacerbated one shot situations.
I'm surprised that there is no triangle. That is very weird. But overall you got me interested in Echoes. If it's not doing what Awakening and Fates are doing, it can only be better. Just the "dungeons" part didn't resonate with me.
I'm an Awakening baby here, and yeah looks like we're of opposite minds on this. I loved planning out team comps and the satisfaction of seeing my own unique builds working just as planned! Sounds like you're more of a minimalist so I definitely see Echoes being a good fit for ya.