I'm a lazy guy, even when wanting to actually do the boss. This allowed me to nail the movement mechanics while not having to think about prayers. Bloody excellent.
I managed to complete all of the Radiant Oathplate contracts using this. Worked great for the most part! It still wasn't easy and took a lot of studying/attempts, of course. Switching prayers and keeping Arceuus spells up is only a part of the fight. Much easier though!