basically, instead of nerfing picto they buffed everything else. The biggest changes are:
VPR: removed their boss side debuff that causes more 10% damage, and baked extra potency into the regular abilities (sorta like leaden fist / monk stuff).
BLM: Buffs via enochian, f4, despair and some aoe stuff, re-addition of ice paradox, and a QOL change to Umbral Soul that pauses the eno timer indefinitely after you press it.
SAM: Basically got a mini rework, tsubame is no longer tied to a Meikyo or Tsubame-gaeshi timer, you literally just hit Kaeshi Setsugekka after every single midare. This screws with the loop, you have to do 1 more gcd per minute which means no filler at 2.14/2.15. Ad hoc play unaffected. This also single handedly makes speed samurai viable as this is a pretty massive buff to the basic 10 (previously 9) gcd loop of building up 3 sen and doing your double midare.
My understanding is that captchas were never supposed to be impenetrable, just difficult enough that to have bots (or mechanical turks) solve them at scale is expensive enough to deter that kind of automation. It’s probably getting a lot easier for a computer to solve nowadays though.