Theoretical Sunday LL Comparisons
Comparing a few Sunday speed strategies:
-1 spd Sunday with ~135 speed Jing Yuan. This is a 7-stack + 10-stack per cycle, but you lose JY's 45% atk from the boots.
If you have a super fast Sunday and atk boots JY, you get two 5-stack and an 8-stack. This means half the LL miss out on JY's 25% crit damage talent, but you get the 45% atk from JY's boots
Assuming one Robin Ult per cycle, you get an additional 5-7-10 stack LL based on energy and setup.
This is just a quick speculation. Atk boots JY will likely perform worse than speed boots + -1spd Sunday