Boonshare was pretty busted on Chronomancer until the end of 2016 (wow - typing that out makes me feel old). Signet of inspiration used to transfer all your existing boons, with full stacks, to everyone around you if I remember correctly. Pair that with Bountiful Disillusionment (spamming all your shatters gave you stability, might, vigor, regeneration, and fury) and you could basically fill the entire boon bar on the full team at any time, especially during continuum split rotations.
But boy was it fun. It may have been overturned, but it was -enjoyable- to play. You felt like you were helping your team, you had agency over where you stood, your teammates didn't have to stand in a well for 3 seconds, and you could adapt to mechanics when things went wrong. The problem now is that while things may be more balanced, the spec simply isn't fun when going through the motions. It feels like a lot of key-smashing, with some tight rotation windows, for... ok damage?
I cant believe I'm saying this but at this point I'd even look forward to a healspec on Chrono. The problem currently isn't the DPS IMO - even if we were damage leaders I personally feel like the existing play-style is stale and clunky.