GR100 down in 8:30 with just P800 and 0 augmented gear .
In Season 12, GR100 took me P1100 and I think 8-10 pieces augmented with +450 stat (that's a 6000 stat difference, which is around +50% damage).
Must say, Legacy builds are fun to build, it feels rewarding to achieve permanent Berserker without Set bonuses.
Plus there's so much room for experimenting; if you find a skill changing item it encourages you to change your playstyle (like an arpg ideally should be, instead of Set bonuses telling you how to play).
I am using the new set with F/R, and Captain Crimpson. Speed clearing T16. The set is super fast. The HC guy is Quin69 using the Sunwuko Set with the TR weapon, and Captain Crimson. My journey is completed so just hacking around for now.