I think you overestimate those kinds of players. Brewster might go out on loan, right? Matip always injured (how would he start for most clubs?). Milner literally in the final years of his career. Ox buddies up with Matip in the physio room too regularly. Relying on those for depth in case the regular starting XI get injured? Risky.
That leaves Fabinho, Tsimikas, Origi, Minamino, Jones and some youngsters.
@Cicero brought up a perfect example of spending small amount to beef up the squad. I doubt he's on a lot at Man City even if they do spend obscene amounts generally.
Why would you think he doesn't get in to your team? It's about depth of the squad, no? Not everyone you sign has to be a starting player?
If you don't know what some people expect then you can't have been reading any of our posts . Just to clarify, no-one is expecting you to break the bank and/or bankrupt the club. It really isn't unreasonable to spend small amounts on good players that could fit in to your team and that Klopp would get to sync in to the current squad.
There are bargains out there. Good deals for players that can work in a squad. Wijnaldum was only £15m (??) and look how good he has turned out to be. Same with Robertson.