Right now i am a wind main user and objectively speaking dance of impetus is too strong and should be somehow nerfed, but for the other things you said no.

Flower guard is nice but the only op ninja you c*e it with right now is konan angel of god and since konan is wind using it means to not use wind enhancement and still any masked man or shisui (and in particular the latter is a plague and is everywhere) makes it useless.

About the clones yes, they are annoying and they have high combo rate but they are made of paper tissue and wind main itself is made of paper tissue (just consider that for example if i swap from water to wind or from earth to wind i lose over 1000 power and this is with +hp mood) and the clones are good if you face some lineups but are very counterproductive if you face other lineups (like for example heavy repulse teams, like ay 3rd, six tails or itachi susano'o based ones that by simply selecting your clone as a repulse target they flat out nuke whatever is behind them because the clones have no defense/resistance (they just gain 30% of main... ))

The 4th mystery unlocks at level 80, sand dust is a 4th mystery exactly like skewering. The reason why those 4th mystery were added in 2.0 (before the 4th column of talents did not exist) is exactly because they are supposed to counter root of warrior teams, while sb 4th mystery is there to counter poison tai teams, or at least that was the original idea.

Water main can endure round 1 and 2 and keep you under chaos permanently until you die, both with mb and with bd. Kisame samehada + angel konan is also a perfect shark bomb neurotoxin team if you use as 4th ninja kurenai or gakido.

About arena... if you own initiative gengetsu, mei, jinpachi with azure fang let you beat almost every common team, overall shisui teams because shisui flat out dies under the combo started by gengetsu in round 1, and is annoying against a lot of rare teams. Wind main itself, being made of paper tissue dies even if has the shield of flower guard if hit by the combo of gengetsu.

An even easier to get arena team with water main that kills with ease most of the wind and lightning teams? Bee sst, kushina habanero, sailor sakura. Another one? Kisame (both normal and samehada works), kushina normal 3 star, kabuto snake cloak.