Whilst I am generally in favour of LIFO it certainly does result in dead wood in the form of career FO's who are not up to a command (some of them by a very long way) and yet sit for years at the top of the list whilst far more capable people at the bottom get made redundant. They get the best pay, the best leave and job security as a reward for not being good enough to be a Captain, hardly seems fair does it?.
Possibly true but it's not a major issue with Baby. A career FO will not prevent others below from progressing to the left seat and can be a valuable asset to the company. Dead wood (if we even have any) can be weeded out in other ways such as re-training. If LIFO is replaced by perceived merit/management selection it would IMHO create a brown noser's paradise.