I think the only difference with respect to timelines is that opportunity is fewer and further between for goaltending.
If you look at Petruzelli for example, how many AHL rosters would he be on if he wasn't in the Leafs organization? My guess is over half
So it's really hard to fault a guy like Keith or Peksa in the previous example for playing in the league they are in sometimes. Which kind of skews the timeline logic a bit. It is much easier to play higher levels as a skater, even if that is in a reduced capacity.
Not saying that you specifically are, but we shouldn't be comparing Peksa (6th rounder) to fellow countrymen and KHL products like Shesterkin, Samsonov, Sorokin, Vasy...etc. His progression was never going to be as rapid. Same goes for Akthyamov. These players were drafted with the hopes of one day becoming an NHL goalie, and there likely was little to no timeline on that when they made those selections IMO. Whereas the top tier guys, even Joe Woll, You'd be making that selection with more of an idea on high and low projection in terms of timeline. I think any goalie selection made outside of the top 3 rounds are kind of set and forget, slow cooker type of prospects. Let them marinate in whatever league they are in and just cross your fingers they eventually put it all together. Even if they become NHL'ers at 27, that's likely 5 good years of tending.
With Peksa and Akhtyamov I see raw ability in both of them. They are both very athletic, and maybe with they right coaching could become something.
Woll on the other hand is neither athletic or technically sound IMO. It would take major improvement in his game to become a true NHL #1 IMO.