I think Barcelona still should make two transfers to specific areas. These areas are defensive midfield and centre-forward. Because in the defensive midfield there is still only Oriol Romeu. Of course players like de Jong and Kessie can also play there. However their main positions are central midfield so it is better to use them there.
I would agree about both but let's see how capable barcelona in buying the new players. The club has not raised money from selling the players. All of players that being lined up in the list of players to be sold by the club already refused to be sold by barcelona.
Barcelona is not financially good at this moment in recruiting more defensive midfielder and centra forward. CF can be a risky position caused by lewandowksi can get injury anytime. There shall be a backup for him.
For the other position there is only Lewandowski there. Barcelona don't need to spend so much money for bringing a striker. They can even loan someone who can be useful in Lewandowski's absence. Signing a backup striker should be even the priority for them.
Barcelona can take felix as loan from real madrid but the main problem is now whether barcelona will be interesting to do that or not. Barcelona has been even linked to the mbappe which is unreal for me.
I do agree with you in this point if barcelona needs to prepare secondary striker to be lewandowski's backup.
I am personally satisfied with Barcelona's performance last season. They completely dominated La Liga and managed to win La Liga. Hopefully the Barcelona team will improve themselves tremendously this season and try to do well in the Champions League as well.