Oh man, this is a very spicy topic.
Well it really depends on the community and the stance on newbies to the franchise. I think what is believed to be common sentiment(correct me if I am wrong) from the 'elitist' perspective that basically if you aren't restarting every chapter and crying over difficulty, that is is not fire emblem. I know that fire emblem is(perhaps was) known for permadeath gimmick, and sometimes difficulty of the games. Personally, I like new people entering the franchise and I generally do not like the 'elitist' vibe that you sometimes get out of some of the people here that think that they are hot stuff. All in all i will say that FE has become easier but honestly as long as they give us higher difficulties people should chill the heck out about FiRe EmBlEm Is ToO eAsY.
I mostly blame the turn-wheel mechanics for this exponential decrease in difficulty. With turn-wheel mechanics, difficulty basically becomes a non-problem because you just go back in time if you make a boneheaded mistake. It is a very nice QOL change however I do think that they should reign it in for future games.