Quick comment on the quality Italian Serie A. It may not be up to the standards of the PL but it is a good league. In the past two seasons, I started watching the Serie A and Bundesliga more than usual (in addition to PL and LaLiga) and I would say the Serie A has the best teams top to bottom than any other league expect the PL. Even though the defensive style of football it's known for is still used by many teams but many of the top teams are playing a more progressive attacking style of football. It's not the Bundesliga in terms of end to end attacking, nor does it have aesthetic quality of Spanish football, but it's not your Serie A of 10 years ago for sure.
The advantage of a player like Lukaku is that physically there are few defenders who can match up to him in the Serie A. It's a similar situation for Haaland in the Bundesliga. The VVDs, Laportes, MaGuires, and Rüdigers of football just aren't as plentiful in other leagues. Still the Serie A has very good defenders (Koulibaly, Manolas, Chiellini, Acerbi, etc) and it's not a farmer's league.