C'mon man. Of course we aim to improve our starting line-up immediately, if the opportunity presents itself. Every club aims to find purchases that immediately improve their starting XI. If this isn't financially feasible, or the market doesn't present the right opportunities, the club switches to improving the bench, and finding potential stars of the future.
However, banking your future on players with high potential is not the way to become a club with sustained success, as the majority of these players don't live up to potential. We all hope they do. Coman, Sturaro, Berardi, Pereyra, Rugani, Leali, Morata, and so on... Even if not one of them becomes a Pogba story for us, if a couple become 30+ mil rated players that will be amazing, but our club isn't going to be very successful on the European stage if we don't at some point start spending money on established starters.