Recruiting more is not a guarantee if in the end Arsenal's pattern remains the same where their winning mentality is not well formed so that what they do including good performance at the beginning of the season as they always do will slowly erode and decline when Arteta is unable to maintain consistency.
Previously, Arsenal also had some good recruits, but still, they still couldn't do and get the best results. It's not easy to compete in the Premier League, but Arsenal has the same pattern, their achievement is "close to win the EPL, but again failed." and this has happened for years.
In this transfer market, Arsenal actually only needs to get something much better, not more.