*sigh* and onto the bad news. While I don't expect everyone to agree, I always felt Medusa's nerfs were unnecessary given the cavern-like structures underground providing you with plenty of cover in most scenarios, added with the fact that her biome is avoidable, especially if you got killed in a certain area, as you know approximately where to not go. Given the sandbox nature of the game, you can easily proceed with caution and use blocks and building to iron her away, if she's really that much of a pest.
While she was nerfed to no longer serve as a good miniboss (who was honestly way less annoying than the wallhacking wyverns), the fact that you can now abuse her AI even more, makes me disappointed. Anyone who's played Terraria for more than a day knows that if you stand directly above ANY mob, they'll just stand right below you, trying to reach you. At this point, if Medusa can't even petrify you (Which wouldn't do much anyway, as you're out of reach), you've basically got yourself free farming for her head by just standing on a platform.
Then you went further and made her Hardmode-only. Despite the fact that she's a normalmode mob. And she is no longer dangerous in hardmode, especially when you hookshot to somewhere safe above her.
To me, Medusa lost all her vigor, slightly scary appeal and role as a "terrifying foe", when she got put away until she's no longer relevant, with further nerfs. I know I don't speak for everyone, as a lot of people find her to be "too hard", but I feel you could AT LEAST let Expert Mode have her be a challenging "let's hope we don't run into this legendary foe" twist. Expert Mode was made to appeal to the most hardcore of players, no? I never had an issue with Medusa, I infact loved her when initially introduced. Maybe it's because I'm of the "better players", but again, that's all the more reason to talk about Expert Mode.
I hope you reconsider when it comes to at least Expert Mode. Infact, I'd like her to be buffed and have a more important role as a miniboss; accessories like mirror sunglasses could be a way to combat her abilities and stun her for a few seconds, hit her, and quickly move back before she rips your face off.