How is the state of the Chronomancer as of .4?

It's good only if you want to build around very specific game mechanics: ignoring or reducing cooldowns, recoup, any spell that benefits from cast speed and area, freezing or slowing down enemies. If you want to build around anything that is not mentioned above, you're better off with other ascendancies.

Not as good as it was in 0.3 because they nerfed the lineage support that let you while entire screens last season. I forget the name, the one where curses did damage that scaled off of intelligence. But I was still able to kill all pinnacle bosses, but it took more work and better gear then my Oracle and Tactition. Honestly I’d say all caster characters feel really good this season.

It is the second least popular ascendancy, above gemling.

The reasoning is, bluntly speaking, it is just not good. It is like bringing a bicycle in a car race. You can still finish the race, but you won’t win any prize and probably not having an amazing time either.

I really tried to play her this league, but it leaves a lot to be desired

Her ascendancy really only gives utilities that may be nice as a support in group-play, but lackluster in solo

Not enough, or any, skills that could meaningfully take advantage of her cooldown reduction / buff duration

Her recoup capabilities aren’t all that impressive, requiring high investment which doesn’t compare well to the other defensive layers

Temporal Rift is unique and fun to play with, but has a major flaw of being an entirely reactive kind of defensive, and feeling gimmicky. You can already achieve this level of survivability much more consistently, without.

Likewise, the same can be said for her curse bomb ability - instead of waiting for it to go off, why not pick an ascendency that directly increases your DPS

Less than optimal for nearly anything, but has a decent kit to make things fun, IMO

I think i saw someone showcasing it on one of DM's build or bust vids on youtube and they cooked it pretty hard. No idea what they did but it was doing well in a super juiced t15

I went CoC comet lich and had my friend go rarity/curse support chronomancer. It worked well, he was feeding me elemental infusions which was nice.

One of the worst ascends in the game, does everything poorly

Its niche, but if you like that niche its fine. Recoup can make you immortal on chronomancer.

Not really good, unfortunately. For most of the archetypes you might want to chose, there are other asncendancies that do it better.