Arsenal have become defined by their recent history of poor decision-making in the transfer window from Arsene Wenger’s time through to the early stages of Mikel Arteta's tenure.
The Gunners let go of important talent due to an inability to guarantee a clear pathway to regular first-team football. Looking back, it is easy to say with regret that the club made errors in their judgement and have seen so many go on to flourish elsewhere.
Donyell Malen, Ismael Bennacer, Yunus Musah and most famously Serge Gnabry have left for bigger and better things and become crucial components of the setups at Borussia Dortmund, AC Milan, Valencia and Bayern Munich respectively.