i think buffing shield str 10% would be a pretty solid move tbh: it helps 1H warriors be a more viable option, and also (assuming we never get khanjar or kebab/fan) helps str bandits close the gap with luk bandits.
currently it only adds +3str compared to +2str for a 60% which makes using it kind of pointless, but if you buff it to +5str for a 10% scroll, you can realistically scroll a 15-20str shield for your warrior or bandit. My memory is kinda shit but I think a 20str shield (1 10%, 6 60%s on a 3str base - not easy but not impossible) is roughly equivalent to +3~6atk for a warrior depending on level which is a nice boost but nothing game breaking where suddenly everyone is only using red katana or spartas like in Legends/Royals.
For str bandits, if you're trying to equip a cursayer you're currently foregoing anywhere between like 30 and 50 points in luk depending on your gear. if you can bring that down to like 15 ~ 25 luk with a well scrolled str jurgen, now the (potential) +2atk that the cursayer has over the varkit can maybe begin to make up for the AP you invested at higher levels where w.atk becomes more valuable.