Mensa...I see your point, but you are confusing lower experienced FOs with bad FOs.
Ek had to decide which road they want to take.
1. Former captains/ Older FOs segment. Everybody starts in the RHS. Upgrade in turn. Abolish the 3 year policy. No fasttrack (they are kind of DECs)
or
2. DECs/ Lowtime FOs. Younger DECs will come for the rating, older DECs just for the hell of it. Bit of golf and beach before retirement. Young FOs with 2000H are always available.
Both options will work on their own. Mixing them is not good.