Being a First officer is the time to make mistakes
China Hainan Airlines operating A330's would agree with you but for a different reason. Their F/O's have caused frequent damage to the aircraft with heavy landings and tail strikes on take off, that the authorities were forced into taking drastic measures. This disproves your assertion that being a first officer is the time to make mistakes. Tell that to naïve fare paying passengers...
F/O's in that airline are now not permitted to conduct take off and landings until five years on type. While that means the captains get all the take off and landings, at least the passengers can breath a sigh of relief. It is also an indictment of the poor training undergone by new pilots to type. It is a good bet that the accent during type rating training is predominately on full use of the automatics with very little time spent on manual raw data handling in the circuit and crosswinds. Better utilisation of valuable simulator time is one solution.
Other SE Asian airlines pushing low hour cadets into the right seat of jet transport jets have similar restrictions in experience level when allowing take off and landings by first officers. For example 800 hours on type on line before being permitted to take off and land.