You're not wrong, but it's going to be hard to sign players like that when we can't offer UCL football. Hell, we most likely won't be able to offer any kind of European football next season. Those players will have options, they'll take big transfer fees and probably even more inflated wages to tempt them here.
I'm sure the club will still have eyes on targets like that, as we need to sign players who might be about to explode and come into their own. They will still each represent a risk though, as that might never happen. The days of signing the best players from other PL clubs are long gone as well, so you have to look outside, and so that means you aren't signing PL proven players.
Quenda is one of the best teenagers in his position out there right now. I see it as similar to us signing Yoro. We won't see their true impact for a season or 2, but it's a player we could actually get, despite a number of admirers, and before there's a £100m price tag slapped on him.