So it is perfectly realistic to see yourself from outside when interacting with people and picking flowers... I see
Another argument I hear often here is "If you don't like feature x, go play game y!"
Warhorse sent this game to early access to make it the best game possible for the audience (realism and medieval interested players).
Games will be different and unique because of the combination of those features.
If you go for realism the game would be more of a dress up game than a sword fighting game, because even the Lords spent more time on this than actually fighting.
I love that it is neither, but it is an realistic RPG. Dressing accordingly is as important for social interaction as being skilled with weapons to defeat the enemy and eating food to survive. And for me it's as immersive or even more to see Henry doing it than seeing it from technical 1st person.
About modding. It won't be difficult for devs to implement 3rd person, but they decided not to do this because of a poll. It will be more difficult for modders to achieve it because they have to learn the ways, but be assured that 3rd person will be made.