Country: England
Arteta has talked how youth cannot be given too much responsibility so their development doesn't stunt.
Willian gives us instant EPL top 4 quality with free transfer, and is not on the way for next years to give more & more time for the youth.
I'd honestly rather save the money and use those wages to get a player we desperately need (because I don't think Willian is a necessity) with the required quality and profile.
I'm not even really thinking about this transfer window I'm thinking a year down the line we might be kicking ourselves as we have yet another player over 30 on wages over 100k (I think the 220k is sensationalist as it factors in the signing on fee) that we might struggle to move on.
For example we remove Willian who isn't a necessity, Luiz that we spent around 16M on last season and Sok that cost 17.6M (not even counting wages) and that's around 30M with a decent wage offering.
Of course we needed defenders at the time so it's not as simply as saying we don't sign Sok and Luiz, but it's better to just deal with an area of the pitch properly in one go even if it means there's gaps we need to fill next time, rather than buying up junk or oldies that we're then struggling to move on later.