from WT:
"Once enough skills in the target person are 100%, you can encourage a secondary interest in them. Once the
appropriate secondary interests are applied, you can then promote that person to a new
Archetype, which will..."
As I've seen & understand it, that's *HIGHLY* incomplete, right? Those "secondary interests" have to all be filled *AND* match the AT---or it won't work. (even after you "apply" the 2ndary interest, it still has to reach 100%?)
Which means can take a great deal of time *JUST* on the "secondary" interests.
("GRIND" assumes you can do something daily, *AND*, make progress on that. This is nothing like that. )
PS
I used to be a SP fan---but the *COMPLEXITY* (& grind) got INSANE!
+, Dev does WORST stuff 1st (who loves to sweep streets & clean toilets?!?) & then never finishes the most fun stuff! [hero/hero training, etc]
Most of the "school" stuff didn't really matter (you could go to school/classes for years & never graduate! ) & despite all the hints "guide" (changed a lot by version) & countless hours, I never ever EVER did get both T & D in the club!
anyway...