I'm not a huge Nightwish fan but Floor is my favourite of the vocalists they've had, and her versatility actually fits the band better than Tara, who was better at that particular style of singing, but obviously that came at the expense of others.
I greatly appreciate the talent and work she's put into her voice - she can sing anything and make it look easy - as evidenced by her appearance recently on a Dutch reality TV show (with a great concept*) where she sung a bunch of different genres confidently, left her co-stars in awe and inadvertently made herself finally famous in her home country as by and large the public had no idea who she was up till then.
*It was called Beste Zangers (best singers). Basically, a bunch of Dutch singers from different genres spend a short time together in a resort in Ibiza. Each day a singer sits centre stage and the other people sing a song to them, either a cover of theirs or a song that holds some meaning to them from their life. There's no winners or losers, just artists appreciating artists and being challenged to get outside their comfort zone. On the last episodes they sung a bunch of duets and Floor did Phantom of the Opera with her childhood idol, fellow guest on the show, and actual Phantom of the Opera on stage back in the day, Henk Poort.
Unfortunately the only subtitled versions are fan-made and kept getting taken down from YouTube, but if you're a Floor fan and are interested then if you google Beste Zangers Denise Hofs there's a Discord where they're hosted and tbh it's much better watching the entire episode to the see the context behind the song choices and discussion than just the songs themselves.