I have often said that Arsenal does not really need new players in the attacking force. Because what Arsenal really needs is high consistency.
On the one hand, I just think that Arteta is known as a coach who is able to produce a player talent. But why did he choose to spend a lot of money just to get Wirtz?
Meanwhile, for me, Arsenal current attack line still looks very good and has solid performance.
Imao Arsenal may bring in a striker because with a high schedule and target, they certainly need more options for preparation. Rather than just relying on the players they have, Arsenal will experience an imbalance if one of them is injured. The solution to a busy and tiring season is to have many more worthy replacements so that they can maintain consistency in their performance. Arsenal themselves are candidates who continue to challenge Manchester City in the Premier League so when they have a striker option, Arteta has more ways to concoct attacks. Because Arteta is a smart coach and deciding to recruit Wirtz means he is believed to be able to provide additional strength in the attack line.
125M EUR is a fantastic figure but it's worth it for Wirtz as long as he performs similarly at Leverkusen.
It is possible that bringing in Wirtz will kick Havertz out because this player is not so impressive while at Arsenal or indeed as you say Arteta does not want when there is a problem of attacking line injuries lack of players so before that happens it is better to bring in players first, in addition to the current schedule.
Still asking if Arsenal will give so much money for this one player? Arteta's desire seems clear that Wirtz is a great player and fits at Arsenal.