Romero (Seria A defender of year, WC winner, Copa winner), Bentancur (3 time Seria A winner, 2 Coppa's) Richi, Maddison, Solanke are exactly that. Perisic was that.
Yes they are holes in the team (LB, GK, RW, maybe DM) but that's ignoring the starting lineup -> Vic, Udogie, VDV, Romero, Bentancur, Maddison, Deki, Son, Solanke, Johnson plus bench Dragusin, Spence, Werner, Biss, Richi, Gray, Bergvall, Davies, Wilson, Moore, the entire squad has 2 players from >4 seasons ago, Son & Davies, and only Son is a starter.
The problem is you can't refresh the entire squad and get top quality (finished product) at same time, so you have to make trade offs, in my opinion (I don't have insights inside club) is it looks like we choose to solve the depth/refresh problem by going with promising talent (Gray, Dragusin, Bergvall, Moore, Wilson), while still picking up the Maddison/Solanke type signings
Ange has been backed as well as anyone can expect. Spurs spend in the last 4 years is competitive.
The proof is in the future, we have a good pipeline of youth (Vuskovich, Moore, Devine, Yang) to still leverage, will there be another Solanke or two next summer?