Bayern Munich and Real Madrid are both lacking an important thing in their squad now which is a striker. They both have strikers in their squads technically of course but they don't have a reliable one for especially the Champions League. Bayern Munich's performance was quite inadequate for this reason last season as well.
Real Madrid have also lost Benzema and loaned Joselu. But Joselu has surely been brought as a replacement for their future main striker. But they have still not made up their mind on a target yet. There are only rumours on the internet.
But I believe both teams will manage to solve their striker problem before this transfer window closes. But I can't be confident about the time period before the season starts officially.
Real Madrid's sale of Benzema is as a result of the fact that Benzema is of age,and wants to try a new challenge elsewhere.The team needs to give younger players some chances to improve and show their abilities in the team as well.When Christiano Ronaldo was in Madrid,Benzema wasn't the main man in the team because there was someone who was ahead of him in goalscoring which was Ronaldo,but since Christiano left to another club,it has been Benzema that has been scoring the goals and has been the main man in the team,therefore, opportunities needs to be given to youger players so that the future of the team will be guarantee.
I know Real Madrid needs to go into the market and sign players whom they think can give them results that they want,but I still think giving young players opportunity to shine is another way of discovering future stars.In addition,Bayern Munich does not need a striker,all they need is a good coach that can integrate the players together,and bring out the best in them.They have Serge Gnabry at that team,they also have Sane and Mane that are very sharp in attack,so the Idea of adding another striker is not really necessary to me.