Pagos is fine as is if you're going for one relic weapon. It remains to be seen how it'll look if you want more than one.
Players reached lvl 35 around two days after the content was released and I saw a few relics over the weekend, and this was done when more than 95% of the players were at a low level, meaning fewer NMs would be spawned, and when spawn conditions were not known (spawn conditions are still being worked out).
Mobs that mutate or adapt give a x2.5 bonus. The 30th kill in a chain gives a x5 bonus. The entirety of a 30 chain is equal to killing 55 mobs. In the 30's, you get around 3.5k per mob, which translates to 200k exp with no mutations, no exp potion and no fairy exp bonus taken into account. If you get a mutation on chain 30, that kill alone would give 40k. Mutations/adaptations don't revert if aggro is reset, allowing you to save one for a chain 30 kill if you get it early in the chain.
A chain of 30 in a party of eight at five levels below the mob takes 15-20 minutes and you only need decent dps for the last part of the chain. If that's too long, you can always do +4 mobs or lower. Don't want to chain mobs? You don't have to. You can afk and wait for NMs, though you won't progress anywhere near as fast as those that grind, which is how it should have been in Anemos.
Because chaining mobs is a thing again, the fairy has use, since it gives a 10% exp buff (doesn't apply to NMs) and an increase in damage dealt.
In Anemos, there was no reason to kill any mobs but those that spawned the NMs. Mutations and adaptations change that. In Anemos after the first few days, dying meant sitting there and waiting for a res. Sleeping dragons, the map layout and chaining means getting a res isn't as sure a thing.
There are complaints about it being boring, but what are the suggestions? "Buff this, nerf that"
There are complaints about the exp grind, but it's the light portion that's the real grind.
Issues with Pagos at the moment are the lack of a sync function, kills having a small chance of not registering and to a lesser extent, AoEs on snow during heatwaves being a little difficult to see.
Buffs and nerfs aren't so simple. If they implement them, it would be an insult to the players that did the content early. The content will be nerfed in the future, for sure, but in a few months, not when the content is a week old. It would set a bad precedent: Don't like the grind? Go to the forums and complain until it gets reduced.