We spent the entirety of last season missing a striker to replace Aguero. Haaland fills that gap. Alvarez replaces Jesus as a versatile forward player. Palmer, we were told in January, replaced Torres in the squad. Now we're being told he's replacing Sterling as well.
If we do choose not to replace Sterling (looks likely), we'll be losing an important dimension to our attack. I'm sure Pep will tweak things, but I'd like a bit of pace.
With Mahrez's age and contract situation, there's a ready made place for Palmer to take as his successor, (the same goes for Gundo and McAtee).
I really don't believe signing a new winger this summer would harm his development, especially with 5 subs and a ridiculous schedule. Don't forget he can play in midfield too.