The first one is always free. Mini-boss fights

All the mechanics pinnacle bosses should have a mini-boss version that you would get for free. This was a solved problem in PoE1, I don't understand why GGG must relearn these lessons all over again in PoE2.

Audience with the king, Xest, Orloth... and whatever ones they add should have a account bound, free drop version of their boss with lower damage (maybe keep the Hp so the battle lasts a bit).

This allows newbies to practice the fight as many times they want until they are able to learn its mechanics and defeat the boss. Kind of like you do with the Trials first token. Account bound, of course.

If you are worried about farming exploits, just have the run give 10% hp and loot drops. At most you can give some prize when the boss is defeated, like 1 Greater Jewel for example, to smooth out people's bad luck in progressing their build.