A World Class goalscorer would be an asset, but it's only in computer games that you can just spend money without consequences. I'm not talking about FFP or Budgets but the real impact on other players in the squad and existing contracts and team work.
In Football Manager or FIFA you simply spend whatever money you can to sign a Megastar (like Ronaldo or Haaland) and pay whatever they ask in wages. Their attributes then add to those you already have and Hey Presto, you win the League and Champions League just like that.
In the real World, egos, relationships and existing salary agreements complicate matters. Imagine KDB when Ronaldo turns up and is paid 2.5 times more than him - is his motivation going up or down?
Other members of the squad will want huge increases when the time comes to negotiate renewals, so it costs you a lot more than just the fees you lay out for the Megastar.
If the Megastar wants to take all the free kicks and expects everyone else to be subservient in his quest for personal glory, this will impact morale and other players efforts. We have spread the goals around the team, which is hard to defend against, but if everything goes through the Megastar forward then others take less responsibility for scoring.
Megastars usually have big egos and can make life difficult for the manager.
So it is not always an additive, there can be knock on effects in the real World that have to be taken into account.
When it comes to making a real World decision for the benefit of my Club then I am happy to put my trust in the owner, the board and manager who have brought us unprecedented success, and who have all the relevant information to make these calls on.
While i agree with a lot of what you write, the best teams to have ever operated have had such setups. Probably why we heard news(albeit rumours) of our own squad reacting positively to news ronaldo might come. He might be on mega money but they know mega talent makes their own lives easier.
Who can deny the likes of messi are well above the rest of football in terms of quality, the problem arises with the likes of ozil, sanchez, pogba, etc earning mega money for being merely good.
5 players are above this for me:
Messi, ronaldo, neymar, mbappe and haaland....any team they join would accept they have special talent and will earn more. As barca's squad did with messi, as real did with ronaldo, as paris do with mbappe and neymar.