Swifties didn't need a nerf after the boot enchant removal
"Reducing the speed they give should help the other options find their footing." I hardly see people build swifties as it is after the previous movespeed nerf, tenacity nerf, and price increase. The merc tread buff ensured that it would be the better option most of the time. Now, the only incentive to buy swifties is an extra 10 movement speed, which really isn't worth the trade-off of a better passive.
If my math is correct, given 400 movespeed with mercs and a 30% slow, you would be able to travel 444 units in 1.5 seconds. With swifties, you can only travel 430.5 units over the same time frame. This effect is more noticeable as the slow percent increases. While this is intended, the slightly higher ms doesn't justify its diminishing effectiveness of achieving a higher average ms.
are really situational unlike almost all the other boots you could build then any time but boots of swiftness you only build when the enemy has some cc
today.
got buffed aswell, so thats even more reason to reduce auto attack damage.
for the tenacity which affects slow duration as well.
on Xin and got permakited before I could reach my targets.
So Swifties are still better.