I think Boots could use a rework
Nowadays there isn't a lot of variety in terms of boots and it's kinda saddening, especially seeing that they add a second layer of itemization to one's build beyond item choices. But there's not much of a choice nowadays with Sorcs and Tabi being the usual go to boot options.
So, why don't we dedicate some of the Pre-season resources to reworking the boot system in order to make them more interesting and more evenly matched in terms of effects.
In particular could use some work, fleshing out their niches and making them more valuable pick ups.
Mercury treads in particular could lose their MR component and be shifted more towards enabling melee champions to wade through the CC-heavy environment of your usual chaotic team fight.
Whereas
and
Could do with strong active effects that give situational power.
All in all I see no reason why we wouldn't want to change the boot system by making them more diverse and adding other powerful effects to them, maybe in form of strong windowed actives or niche passives