Lol if we replace Costa, Matic, Moses and Cahill with Morata, Bakayoko, Danilo and Rudiger we are actually going backwards. I can already see us trying to replace these extremely average players this time next year. Our infamous transfer window where we signed Pedro, Begovic, Rahman, etc would even be better.
The truth is we struggle attracting quality players. Even as champions we couldn't sign Lukaku. If we think Real Madrid's scraps, Roma's worst starting defender and Monaco's biggest donkey are going to improve us then we are wrong.
There are/were actually very good players available this window. Dahoud, Silva, Aurier, Fabinho, Aubameyang, Belotti, Koulibaly, Alves, van Dijk, etc. yet here we are trying (and struggling) to sign overpriced garbage.