Arséne Wenger: "I will miss you"
Why is Arteta consistently praised for having a young squad? Wenger was hammered for the same thing, despite not having the budget.
Who pays these people?
Because the "young squad for the future" schtick was engineered by Arteta and his media/PR shills.
As @field442 explained it well, this approach is designed to buy him time in the owners eyes and his media hacks will have plenty of excuses ready.
The fact that he made a 180° turnaround from signing experience in first summer window (plans for CL in 3 years ) to youth (ones for the future), is a testament that he has no idea but he's just buying himself more time.