Every Fromsoftware game requires practice. Yes, they're challenging, but with a deep understanding of the mechanics and bosses, you can exploit the systems to become victorious. This is true of Dark Souls, Bloodborne, Sekiro, and Armored Core - that's why you can beat the Asylum Demon and Tree Sentinel the first time you meet them. I'm certain this design philosophy will be part of Elden Ring Nightreign as well, but that doesn't mean changes aren't coming. After the game's recent network test, Fromsoftware has heard your concerns with the overall difficulty, and is making some key adjustments to balance the experience.
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