Elden Beast used to be easy. You'd kill it first attempt without using a heal. It was a bit anti climactic but better than the current version.Finished the base game now (and did some cleanup for the platinum - save scummed for the endings of course), took me 170 hours all in all. Phenomenal game but I'm a bit annoyed by those last few story bosses, they didn't feel particularly great. Although Godfrey's first phase was pretty good, and Radagon as a standalone fight wasn't bad either, it just gets ruined by having to repeat it for each go at Elden Beast. I guess it's sort of fitting that the final boss fight perfectly highlights From Soft's greatest flaw: oversized bosses with a terrible camera. Anyway, on to the DLC.
Two things made it very manageable: reducing equip load to light and an emergency medium shield with 100% physical block. The light load does wonders for outpacing/outrolling Waterfowl Dance's first flurry from medium range, while the emergency shield can take the entire first flurry if she does it from close range. Sure, that heals her a bit, but it's better than starting over. Learning perfect reactions to all her patterns certainly wasn't easy, but once learned it feels pretty repeatable. I definitely trust myself to repeat her fight over something like Hoarah Loux and his endless spamming of grabs with space-time continuum bending hitboxes.
DLC Bosses are terrible to be honest. I'd say the base game bosses are getting silly and broken by the end but just about hold up. DLC bosses are just an annoying mess really. Bayle wasn't bad I guess but the rest suck. Very much something to get through rather than something to enjoy unfortunately.