I wouldn't necessarily disagree with you on anything you've written.
Floor is amazing. And songs don't have to be written that push her to her limits just to show that. My problems with EFMB had nothing to do with how she was utilized. I think her talents were utilized just fine. And, like you, I kind of like that the band aren't locked into the operatic style for their new music. The fact that she can just SING in a more straightforward metal manner when called for, then snap into operatic mode when called for, and back again is a big upgrade from either of their two prior singers, and that is saying a lot since both of their prior singers (yes, even Anette) were quite talented.
I do not have a super clear recollection of Anette live, but my vague recollection from the clips I saw and from Live in Hong Kong and Other Places was that she was pretty solid, even if she did have to change up some vocal melodies here and there. As I seem to recall, she made good decisions about altering parts live so she could sing them properly instead of straining and missing notes, and it worked. (or maybe Tuomas rewrote the parts for her to sing--not sure how that dynamic worked) But I thought she sounded pretty good live most of the time because she was smart about how she sang the songs and used her voice.
EDIT: Checked a few clips on YouTube, and they basically bore out what I was saying about Anette. A few that sound pretty good:
-Full set from 2012:
https://www.youtube.com/watch?v=BCkwbVefbzE-Nemo and TPATP:
https://www.youtube.com/watch?v=BUF7E8INwFw-Amaranth (this almost sounds TOO perfect and may be overdubbed):
https://www.youtube.com/watch?v=T_ysv9KEjo8