You're not really fighting the bosses you're fighting the game mechanics plus adds. After that the game arbitrarily makes you fight each boss in three phases just to hold you up. The bosses should be made to actually trying to kill you themselves instead of adds and wipe mechanics. And if you can nuke a boss in 30 seconds then let it because it's not like we're going to kill them 500 times anyway
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Life should be more like Elden Ring