One of the biggest reasons that Syndra is so good in the highest level of play compared to other mages is because she doesn’t have to stop moving while casting her DPS abilities.
Since making her stand still to cast Q after like 10 years of not having to do this would understandably cause massive dissatisfaction for mains, the better way to hit her mobility would be to bring her down to the lowest movement speed tier. For reference, this is what Orianna and Anivia have.
I would rather see some nerfs to Scatter the Weak, either less CC or more downtime, so that she wouldn’t be so completely immune to most melees.
I don’t think her kit justifies lowest MS tier, champions with 325 typically either have movement abilities or perma cc like Ashe or Aniv.
If you go merc’s vs Syndra she actually can’t do anything to you.
Like Sylas/Ekko/Akali rush Merc’s and then Syndra is a cannon minion; Ekko doesn’t even really need Mercs against her tbh.