Boots of Swiftness,a bandaid to Mobility creep

Since every new champ in the game and a lot of older ones too have some form of mobility spell,dash,jump,walk trough walls etc,and the mobility creep is kinda hard on the older,less mobile champs,and i see a lot of people complaining that their once beloved champs feel sometimes frustrating to play just because they have no mobility in a game where it seems to be a trend that every new champ gets some flashy way to escape,chase or evade.

Im suggesting a slight buff to ,since it offers only 10 more MS compared to other boots,and a decrease in slow duration,which doesn't look much compared to that offers +Armor and -10% damage from basic attacks,or Which gives a hefty AP pen bonus,or That gives Bonus MR and reduces every form of CC,including slow,meaning Boots of Swiftness passive is like 1/5 of Merc treads passive,since it doesn't lower the duration of stuns,charms,fears,sleeps and any other form off CC that isn't slow,it doesn't give and defensive stats,and all for what,a bonus 10 MS? If it was like 20-25 or something it would make sense,if the passive made you move faster towards enemies and allies it would make sense,but it doesn't make sense for any mobility champion to be able to buy and mitigate thousands of damage during the course of the game,while that poor champ that has to scrape any mobility he can get just to catch up to or escape from other champions has to trade the defensive or offensive bonuses of other boots just for the sake of extra 10ms and some slow mitigation.

I havent thought out the buffs that Boots of Swiftness could recieve,maybe its just +5MS,maybe a different passive that helps you move faster,lets say every 5 minutes you get 5 extra MS on the boots capping at +20,that way if you buy boots at 15minutes,at 35 you should have +75 boots,that would actually make a difference for some champs that struggle with mobility,while the bonus 30ms wouldn't be a good tradeoff for someone like Talon or Zed that usually have Yomuus and enough mobility without having to sacrifice defensive stats for MS.

Disclaimer: I myself stay away from immobile champs as much as i can,so im not just saying this cause my fav champ or something needs the extra mobility,i just think a lot more champs could become more fun and less frustrating to play if they had some more mobility,and a buff to Swifties can maybe be the answer