Once you've played enough, the fact that it's hard makes it better. I remember the first time I played dark souls, (dark souls III) I beat the 2nd boss months after the first try (i didn't play continuously for those months obviously). I was just unable to beat it. I looked at the wiki for builds, for that specific boss starts and so on.

Once I beat it, though, I kinda knew how to play, and the fact that the bosses were hard made it better, since now I got a big dopamine hit after I finally killed them after tens of tries.

Now, most games I play I beat them on the first try. Not because I'm good, but because the games are easy. I watch other people play and they kill them first try too. I don't get that same sense of "oh this is a boss, it's gonna be hard but fun." Instead I think "oh no, I was having fun oneshotting everyone and now here comes the bullet sponge".