Yasuo was and will always be the masterwork of the toxic and overloaded champion for the board (unless his pick rate go under 8%).
If u are doing a post when u say "X champion is op and need to be reworked/reverted" with a list of strong point without weak point and then use
as a comparision, your post will be upvoted.
Sure both have been picked on pro play and (as already we know) this board is filled with immobile mage and bruiser main.
I said for myself that i like mage and i would never said that syndra is op over other champion like shaco even tho syndra is pick/ban only for pro scene despite yasuo is mostly a counterpick (which has always failed at doing so).
The only moment that i will say that syndra is op, will be when she get 52-53% winrate and high pickrate (i saw some post of ashe declaring that she was an op champion and needed to be gutted losing her slow just because that she got 55% winrate and as like i mentioned before, with a list of strenght and no weakness and also comparing it to an generic yasuo level of toxic).
Board mentality usually is open up more to soloQ rather than proplay but when a champ is already consider toxic on soloQ (High ban rate: Generally assassin or yasuo because they have a dash) but made into proscene after numerous buff, board tend to use the "Yasuo is played in pro play, he need to be gutted to 46% winrate or a rework" rather than the classic "Why riot balance champion around the 1% of the pro scene rather than the 99℅ of casual player" that we actually see on tank on general and karma on this board.
The only way that for the board a nerf is justify on pro is when Y champion is already overbuffed (such has fiora or lee sin even tho both of em got a dash) or has multiple dash (which is what people call toxic champion).
Edit: If someone (more than half of the board user) will read your post, it will be ignored or get downvoted without change anyone mind.