The anime you point from 2003 are not just good anime, they are classic.
I rate all these titles 8 or more.
Actually,I can't point more than 3 anime better than these anime in the whole 2010 to now anime.
The fact there was better show don't make a show bad.
I have seen a youtuber few time ago who was talking about "tomorrow never die" for the psx, at the beginning, he was trashing on it because he made non-stop comparison with Golden eyes for N64 but he then remembered that the problem was not the PSX game was bad, it was just that Golden eyes was excellent.
With time, we only remember the excellent titles and we think that the excellent titles were standard.
For the motivation, I grab it, it just it was just on the surface that is was just a poor explaination.
We never now why Kirie have her power, we never know why fujito family suppress her sense of pain. We never know why ryogi family have multiple personnality.
For me the explaination the movies give is like the one given into Dragonball to explain Ki attack.
But Dragonball is a manga made for kids, in a movie who try to be an intelligent show, it just not enough.
For the philosophy, it's maybe because I have seen show like ghost in the shell and appleseed, but once again, KnK stay at the surface.
I have another problem with the movies, most of the action scene felt unnecesary and are just easy way to résolve the plot with no big explaination (once again, it's ok in a teen serie, not on a show who want to be intelligent).
It make me dislike the fights more than loving it.
After watching the movie, I was even more frustated than after seeing tsukihime anime because tsukihime anime never made any promise, KnK made me promises and at the end of the show, I felt frustated. If I loved movie 2, it's because it's the only movie of the serie who really focus on what it tell and tell it well.
Actually if I didn't really know about nasuverse back then, the Kara no kyoukai movie would have turned me away from it because as the direction was excellent, I would have never know that the writing was really poor. And actually these movies are part of the reason I quit being fan of type moon.
And The music from tsukihime anime is fantastic for me, it's so good I played the game using only music from the anime( and would have not liked that much the VN with the game OST)and use one of the song "cherish" as alarm.