What I am trying to say, not very well apparently, but I'll try again,
I don't think any of the Ranger draftees from 2017 until even this past draft were ready to play for the Rangers in the NHL in the year they were drafted.
I doubt most 18-19 year olds are truly NHL ready, some are, the Crosby/McDavid etc types, however some of those who are not ready get put in situations where it makes them look more like they are ready than they actually are.
The Rangers organization was not ready to have them playing in the NHL. They were not going to commit to developing those prospects into successful NHL players in their draft years, even in their 2nd years. They were going to put them on the 3rd and 4th lines, and not give them any substantial PP time, as they are still doing even now.
It's not a curse, the Rangers made a decision to go with some sort of hybrid rebuild. They signed/extended players long term to play above those they were drafting. Those players in most cases were 7-8-9 years older than the prospects they were drafting. None of the Ranger prospects were ready to take playing time away from them. That is not really a development plan, that is just sticking prospects on the NHL team because that is what other teams did.