Well, we are kind-of between a rock and hard place on this one. While I kind-of agree, there is really no way for us to sign another big name while keeping what we have. Kyrie's contract is up after next season, Horford's/Jaylen's in 2020, and Hayward's/Tatum's in 2021.
We may be able to re-sign Horford to a more team-friendly contract, but we will still be left with what we have above if we are lucky. Leaving out Horford and assuming we don't re-sign Hayward (big assumption), we are still going to be at 3 max contracts in Kyrie, Jaylen, and Tatum. With the luxury tax and repeater penalties looming on the horizon, the only other option is a trade.
If we trade, say: Horford, Jaylen, Rozier, and the Sac pick for Davis and filler, then we increase our top-level talent on max contracts which is probably the best thing you can do in this climate of insanely high repeater tax penalties.
I will be very very interested to see how Ainge manipulates the salary cap these next few years which should coincide with GSW becoming slightly less dominant.