I have trained quite a few Turboprop pilots onto Jets and I have to say ‘more’ turboprop experience can ‘sometimes’ hinder the transition as the thought process of energy management is totally different. Long time on Turboprops mixed with older age are a bit of a bad mix when moving to a large jet. Not always but sometimes.
The easiest pilots to train were MPL Cadets up in the UK who arrived at the jet with 180 hours and 80 hours in the A320 simulator learning to fly the jet. Age also helped as they could look at a manual and retain it. Of course as with everything there were exceptions and a few MPL students also failed.
Being able to skip the normal recruitment process of perhaps a simulator assessment will mean those who are going to struggle are only identified in the type rating which is a waste of everyone’s time.