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it depends on what song they're performing; the behavior on stage should match))) in my opinion... musicians wouldn't be running around to a quiet, sad melody))... but if the song is a bit wild, etc., why not? -)) I'm not saying they should be tumbling around or anything, but they should show energy, feel the music, and convey the mood to the listeners =)
regarding special effects (fire, etc.)... it's fine without them) all you need is lighting, spotlights, and that sort of thing)).
P.S. I've seen a Rammstein performance... I have it on my computer)) I don't really like them... the songs are similar, the music, the vocal intonation... and rarely, the emotions)
P.S. two more animals found themselves again, lol