Another point...
Whereas Dortmund for example seem fairly content to sell their best players, knowing that the financial step to the richer clubs isn't going to be closed we're not quite going for the same overall model.
Dortmund "knew" Bellingham would be sold, was just a question of timing and money. They signing Haaland with a release clause knowing that he would move on if he stepped up. They're happy enough and comfortable enough with their place in the football hierarchy.
I don't think we are. I don't think Levy is. I don't think Ange is. Our situation is different to Dortmund, Sevilla and the RB clubs. We're in London, in the richest and biggest league in the world. We know that if things fall our way we have the potential to mostly close that financial gap that I don't think those other clubs can.
That probably also leads to us sometimes keeping players "too long". Hoping that the next year or two years will be when it clicks and that they will be part of making that difference. It's a gamble it can be worth taking imo.
Frankly if Dortmund had Romero or VdV it would be a question of when, not if, they would move on. They would take the setback and buy again. Dortmund did incredibly for a while losing some of their best players without getting worse, but of course it couldn't last. They can recruit with an acceptance that if it takes a couple of years to develop the team/players again and they have to sell one or two of their best players in the process that's more or less fine.
That's not the case for us. We tried to match the ambitions Kane had. We will try to match the ambitions of Romero, VdV etc. And that will impact our recruitment too. Though part of that recruitment should be getting the best talents before they're the best players. But a part of our recruitment will also be focused on fixing whatever problems need fixing here and now. With some special signings doing both hopefully.