There is nothing to say what we have now is undersized at all. 6-9 6-9,6-10, 6-9, 6-8 is not an undersized front court considering only Sadiq and Donnie would be on the thin side.
6-11 vs 6-9 is not a difference maker if both have the same wingspan and reach and if 6-9 is the better athlete.
The portal had very few options to meet the criteria you are alluding to. All but a few were in the mold of the guys we got or less mobile options that had moderate production. The cost of those few options likely then diluted our options elsewhere.
You build, win then build more as the program provides a better ROI such that you can find and afford elite talent at every position/role to be a contender.