[Autumn]

And on the flipside from giving leeway for botched hits or crits, fleur gives leeway against elemental resistance. Even if someone resisted your Slash hanging, you have 2m of leeway to flex around. They have strengths in different areas and weaknesses in different areas, but fleur is just universally applicable because it applies to basic attack skills and not just basic attack/sub attack.

What would Fleur be like if it didn't apply to sidecut, hanging, warp strike, pinball, cutthroat, geldoren- all of those skills?

Yes fleur may give an advantage when dual wielding weapons of different weapon types or may give access to 4m abilities such as eclair lacroix, this makes fleur stronger in its own ways separate from dagger dance, however strictly speaking damage wise dagger dance wins, its 20% of the attack power of the other hand's weapon, now unmitigated by armor as hard as before. You can't just give that utility to other skills as Kameron mentioned above, gap closers like sidecut and hanging are already very strong, on top of abilities like Ether Invitation and Geldoren and repel doubling down on their effects suddenly which could spell disaster.

Fleur trades damage for the ability to apply to every basic attack skill currently available, and I'm not open to the idea of nerfing every skill in the game to accommodate for one unnecessary change.