To play the way we do we need the dippers front 3 of mane, Bobby F and salah. All work hard, keep the ball and have great technical ability.
So, this is a valid concern and also gets to the crux of our issues as a club.
We do need the right players in the right positions and tbh I think Ange's system needs even more than those 3 positions to be perfect.
BUT... if you want to build any system that aims to be proactive and dominant, you will always need the right players for the system. The issue this club has had for decades now is that the first filter that defines the transfer list is the the economic filter...i.e., contract length. age, potential sell on value.
Then once the club had decided that the player was a fit for the business model, we would look at whether the manager or the club liked the player. There has been numerous occasions in the past where it looked a lot like the club liking the player > the manager liking a player.
What Ange is battling to change is getting the club and himself aligned on the players they like and then making that > the economic filter. If that fundamental issue isn't fixed, it doesn't matter who the manager is, we won't win and we will be having the same debates about inflexible tactics and no plan b etc etc et-fucking-cetera....forever
People seem to think there are managers out there with 20 different elite level systems they can use depending on the players they have and always find a solution good enough to win trophies. It's mental. Every manager has a system that they master and perfect. They can tweak it depending on environment but the underlying system will be a single idea. Even the ones that have a system based around adapting to opponents more than asserting a dominant style still need specifically high IQ players.
This post is already longer than I meant it to be but the TLDR is that OF COURSE Ange needs the right players for his system. Every manager does. And yes it's going to be ugly occasionally - sometimes more than occasionally - until he has those players and the depth around them when they are unavailable.
The plus side is, those names you mentioned for Liverpool weren't mind-bendingly expensive or relatively outside a reasonable economic range for this club to sign. Given time, there is no reason Ange can't build a squad to fit this style.