There's a lot of small nerfs to Bladelock, compared to the UA builds. Blade Pact no longer enables Mastery traits. The third attack costs yet another invocation. Lifedrinker is limited to once per turn. There's no easy and economical way to get Medium Armor or Shields.
It's enough that the next time I want to play a gish, I'm almost certainly going to go with Eldritch Knight Fighter instead. I'm not saying that Bladelock is dead, but it's been narrowed down considerably into something I personally am less interested in playing.