I'll explain my rationale - I don't think we're going to see early movement/everything in place by the time Fulham come to Goodison for the opening day of the season outside of players like Che Adams, but I still think we need those additions to the squad
Other football clubs are aware of our dire financial situation, and know that (1) We need to improve the squad; (2) We are currently sell to buy/very low opening instalments like Onana. As a result, other clubs for the most part know they can wait for Everton to lower their prices as we get further into the window and need to start moving on players at lower cost (although Thelwell and co have actually done relatively well thus far with ISS and Simms sales).
Moreover, other transfers have a domino effect - see for example West Ham moving on Rice, possibly then going in for Onana (guess work but the big transfers have big knock on effects in the chain). Even loans typically happen towards the end of the window as it becomes clear that there isn't a space for a player on the periphery of the squad or they haven't impressed a new manager in preseason.
What this all means for Everton is that if we want to bolster the squad (which we especially need to do at the top end, given DCL won't be fit for the first few games judging from club media), we are limited to targeting players at clubs who have worse leverage than ourselves until we can make a big sale (Pickford, Onana, Branthwaite, Iwobi, Gray to Saudi?), and then you can invest in your quality young players with room to grow (Bilal Toure, Elanga, Boniface?).
Adams is the best of a bad bunch in that regard imo - players that the selling club will want to get rid of quickly, that fit the style of play (unlike say Maupay), that won't be wildly in demand from elsewhere, and have proven themselves to be at least lower end Premier League forwards.
I agree that we can't waste that early run of fixtures like we've done in the past; this requires getting a forward in early doors, and Adams ticks a lot of boxes in that respect. Should also be said I do actually think he's better than the goals to games actually suggests and would improve the squad long term, but that's not really the broader point I'm trying to make