It's true that we haven't gotten any Modric-tier, transformative talents yet but that requires great scouting and quite a bit of luck. Not necessarily a lot of money depending on which league these players might be in. Like
@Raziel said, not too many duds which at least will help our bottom line when it comes to the players retaining their value unlike Ndombele or Lo Celso. We've had so many years of buying mediocrity like Njie and Nkoudou so at least we seem to be heading in the right direction.
And I know it's still not completely possible to judge Destiny Udogie, but I really do think we'll have a good player there. He just needs to work on developing the defensive side of his game but ultimately time will tell if he can handle the PL.
Players like Perisic though... I thought were smart moves but in hindsight turned out to be the wrong choice.