Minimal AGI vs task AGI

• I'm not clear on what the difference is here
• See MIRI's strategic plan from end of 2017 where they make this distinction
• It seems like MIRI went from:
  • a one-step view: just build a Sovereign
  • to a two-step view: build a task-directed AGI first, then go for Sovereign
  • to a three-step view: build a minimal aligned AGI, then task AGI, then Sovereign
• I'm not sure why "three" is the right number of phases (why not two or four?), and I don't think MIRI has explained this

see my question here: https://www.greaterwrong.com/posts/hL9ennoEfJXMj7r2D/two-clarifications-about-strategic-background#comment-yNGuxf4Gs27wW72Jp