Still early to tell - but honestly:
It doesn’t feel that bad.
Cleared a GR125 13:40 solo non-seasonal PTR, same exact gear, build and paragon that I cleared GR131 in season (Cold Vyr Chantodo). Still a nice rift on the 125: scavenger festering, power, conduit, bad follow up, but 3rd level was swarms, w/ Blighter.
Was still able to run GR100’s in 3 minutes with the same build and similar gear as I had in season, where I was running GR103’s.
First impression, it feels about a 3GR nerf, or ~60% less damage. No Triune is a big hit, at least 3GRs worth. Could be that the AS scaled damage benefit was limited to ~3x instead of 5x. Again, this is just a guess / estimate. Would require more testing to confirm of course.
So yes, it’ll take a bit longer to get fluid T16 runs and running groups won’t be as beneficial, but it will still be fairly strong.
With Squirt’s bug being fixed, it’ll feel much better to push and run speed GRs with. The slated seasonal bonus will also work well with high AS trash killing builds.
EDIT: we have to keep in mind, next season we get a stacking bonus for up to 2X damage, this is equivalent to a permanent triune power circle, or endless walk damage bonus (~4.4 GRs worth’ once stacked up fully - though 1000 on kill stacks can take quite a while to build up).
At least next season - Chantodo’s will still have a place, especially for solo players and non-meta speed groups. (assuming no further decrease to power)