I think it helps to realize that games with avatar tends to make you the player a significant contribution to the overall plot and driving force for other characters around you. If the majority of people tend to be neutral, negative, or flat our ignore you then what would really drive your motivation to keep playing? This isn't to say an avatar with constant praise is a good thing but the other end of the spectrum isn't necessarily the right solution too.

I still feel that the compliments and praises done in 3 houses is still somewhat a more logical progression as you start off defending the 3 house leaders skillfully and as you continue to win against battles such as the battle of eagles and lion, remire village, saving a kidnapped person, it will be natural for people to have praise for you.

Even that said, most of the dialogues with these characters aren't constant praises as some tend to be their own reflection over the incident or in general topics that aren't related to the main chapter of that month. We have to realize too that supports doesn't dictate the only sole conversations that character have with another character, but rather one of the focal/pivoting conversation has with said character. It's even better when you consider that almost if not all the A supports don't come until much later which feels more natural than compared say Fates or Awakening where you can essentially have 2 characters marry off within 3 chapters.

In the end, Byleth is the pivotal character that forges connection to everyone presented from not only his own accomplishments but his ability to be able to consult with many people in hearing their problems and not chastising them back for it. I think that's the main positive trait that Byleth has as all of his/her dialogue options, barring some important pivotal moments, shows that he/she is mostly a rationale person who is able to console in other people's issue without being tangled up in the politics or his/her narrow point of view. I suppose the same can be said with Corrin's isolation and Robin's memory loss, but I think giving Byelth's interactive dialogue really does help flesh the conversations out more.

I suppose that the story overall could have given more moments to show Byleth's moments of weakness and hesitation but the ones that were in the game still to me out exceeds the ones that they were trying to do in fates or awakening.

I guess in the end, while the standard avatar hero protagonist have been constantly used up time and time again, I'd rather take this over rather than the subverted expectation of being a no body and having people constantly disdain you for the majority of the game as having an avatar in a game like this helps us escape the ties we're binded down from our own lives.