I think it's about time our favorite ugly little yellow swift strike shields get a makeover. I have two different ideas on how SK could go about this.
#1. the obvious choice * drumroll...* promos!! Release some sort of promo where swiftstrike shield reskins would be in the loot. I would want to see atleast 3 different versions, a shadow, divine and volcanic swiftstrike would be glorious <3.
#2. (the "better in my opinion but more work to implement so less likely-plan") we allow swiftstrike shields to be upgradeable via crafting with many new variations. The new varients would just be a verrry very small defensive upgrade( or none at all) and a change of status type resist. Whichever status resist you choose would obviously change the color/particle effects of your new swiftstrike.
Theres alot more you could play with the stats on upgraded shields too, like taking away some of the attack speed and trading it for move speed, or more defenses as it rises in stars. 4star asi med defense med. 5star asi low defense high etc. that's where the devs would get creative ( or not xD) But I think my 2 previously mentioned ideas would be fairly reasonable and create some much needed diversity.
That first version sounds awfully familiar.
But meh, if we have an upgradable swiftstrike I would recommend that its ASI buff be reduced to medium at 4*, and then universal low and sword low at 5*.
The reason the swiftstrike buckler is balanced in its current state is because it's got so low defenses and such high boosts. Increase the defense and it starts to look like the only viable shield choice, so reducing its bonuses to aid in defense seems logical.