I'm not sure if you've realised this yet, but even if you assemble a group of players, there's only a certain number of minutes a team has available.
Your strategy brings in Draymond, Ingram, and Lavine. Lavine and Draymond are both on big fat contracts, and Ingram will need paying in a year. We would have no money next summer.
The deal I've preferred allows us space in the rotation to keep Moore in the running, who is not a great player but who can shoot reasonably well, and doesn't bring in much salary, meaning that we could have Moore, Trier, and Miller on the team, providing at least some spacing. Even if it forced us to have relatively poor spacing in year one (which it would, those guys aren't sure-fire star calibre snipers), we have a bunch of contracts expiring next summer and without taking on the cap in Draymond, Lavine, and Ingram, these are the guaranteed contracts we would have on the roster going into the summer of 2020-21:
Jrue Holiday, Mitchell Robinson, DSJ, Zion Williamson.
That's it. We'd have one year of poor spacing before we suddenly have multiple picks heading into the draft and a ridiculous amount of cap space heading into free agency.
If you're not interested in a full break-down/rebuild, then it makes complete sense that you wouldn't be interested in this path, but if you are in a rebuild mindset, the benefits of this are obvious. You can every deal off the books going into a free agency that's filled with relatively young players, many of whom are at least competent shooters (Taurean Prince, Bogdan Bogdanovic, Domantas Sabonis, Jaylen Brown, Joe Harris, Otto Porter Jr, etc), and make offers.
The only real downside is that the 2020 FA class isn't exactly chock full of top tier stars, which is a big shame.