The issue with them before wasn't swifties being too strong.
All of the other boots were simply too shit and it was the same with boot enchants minus homeguard.
Mercs: tanks don't need them, it's their job to soak cc not avoid it. If an adc has been hit by cc that calls for mercs, they're probably dead anyway.
Tabi: niche but a good pair of boots. Mainly useful for laning phase but drop off once you're grouping against mages.
Lucidity: cdr was was and is easy to come buy. Why get these over codex/shroud +sorc/swift/beserk?
Beserkers: they were fine.
Sorc: fine as well
Mobies: they did and still do need their base ms increased and bonus reduced so they feel less shit on anything but support. Or only deactivate passive on champ dmg
Swifties: not niche. Any champ could buy em and feel good. Many champs still do. Why? They cheap, and don't fall to shit like mobies.
.
Instead of nerfing them, they shoulda buffed all the other boots by 10ms perhaps? Because people valued the speed, not the passive cos that was just a bonus.
This would've made the decision more about the passive than the speed.
.
Edit: boot enchants? Captain sucked. Distortion and furor were niche af and hg was free. Only one left is alacrity, the least shit enchantment not the best enchantment