Is this something that concerns you on any level?
Not at all ..... remember every pilot has to start somewhere ..... but .... providing that the low-hour trainee is fully supervised by a suitably qualified third member of the flight crew.
If this is
not the case, then too bloody true it is of concern.
Firstly, it is without doubt putting additional pressures on the Captain particularly if he/she does not have a natural ability as a trainer.
Secondly, on the grounds of safety. A low-hour trainee implies a very real lack of experience which, in the event of incapacitation of the Captain, could jeopardise the safety of the flight.
Thirdly, how the hell has it got to this sorry state. Are modern airliners that easy to fly that they only really need one pilot .... Well that is the way it seems to be heading. How on earth can anyone see a career as a pilot with a system like this, and what state will the industry be in when all the current Captains reach retirement.