Not really. The year Manchester United signed Bryan Robson (for example), the club also signed the likes of Frank Stapleton, Paul McGrath, Remi Moses. The year Manchester United signed Gary Pallister (another example), the club also signed the likes of Paul Ince, Mike Phelan, Neil Webb. It's far from some sort of zero-sum game where you foolhardily exhaust all resources on a certain individual, and it's perfectly possible for the club to maximize its budget, and procure a Galáctico (or a Galáctico-in-the-making) who is likely to make a genuine difference, on top a few players who won't cost as much — as long as we offload certain players to improve the balance sheets (and overall financial health of the instutition), and employ clever accounting tricks. Orthodox measures like austerity are oftentimes counterproductive in the sporting realm (much like in the “real world”), and might needlessly throttle the possibly rampant evolution of the project.
For example, Florian Wirtz might cost £90 million or thereabouts, but his wages will be much lower than Bruno Fernandes' (which are in the £13 million per year range), and the latter could be sold for a decent amount of money too — all things considered it's unlikely to be a prohibitively expensive acquisition, and the player is only going to turn 21 in a few months (so he would represent a better investment than someone who seems to be visibly declining and unlikely to be a centerpiece of medium-term projections). Press-resistant, a good ball carrier as well as a good passer, seems sharp from a tactical perspective, one of the organizational reference points of his team already, 10 goals (no penalties) and 17 assists for Bayer Leverkusen this term, 3 x Bundesliga Player of the Month over the course of the ongoing campaign, and would go nicely with the exciting trio of Højlund, Mainoo and Garnacho.