I don't think it's needs overexplaining but if someone has not checked preview:
Tacticals now only giving +2% on Rank 15
Legendary comps only give up to +3%
The character boon bonus has been halved to +0.5%x4 stack
Even the guild boon has been reduced to 8%
Only the Rusted Iron Leggings stayed at -25%, which decimated any build that tried and spent millions to compensate for it.