About when it gets fun.Well Anemos is extremly boring.Pagos is a bit more interesting with the terrain and the addition of bunny fates Not to mention the fates start to get interesting mechanics but the light grind is what makes it really awful.
Pyros gets a lot more fun because the logos make fighting mobs more interesting.Downside is how condensed the map is with mobs making it very hard to move around.

Hydatos is arguably more boring than Pyros in terms of the actual map.Having said that the map is much more noob friendly to navigate with a much lower chance of getting one shot by random mobs trying to get from A to B.
Some of the fates are very interesting in Hydatos.Fun mechanics ona lot of the bosses.There's alot more mobs here that mutate too so which is good for lockbox farming at all levels.
And from what ive heard so far the dungeon seems to be quite fun but nowhere near as extremly hard as it was made out to be.Just it does require some optimisation with parties and logo setups.