If you want to play with the big boys, you have to act like a big boy.
Outside of the Warriors, Clippers (zero championships) and Nets (zero championships), what big boys are spending more than us? And what team goes 10 - 12 deep with starting caliber players?
The Bucks and Heat go that deep.
Bucks - Giannis, Middleton, Jrue, Allen, Lopez, Connaughton, Portis, Ibaka, Matthews, Ingles, Hill, Carter, Nwora - Beauchamp
Heat - Butler, Bam, Herro, Oladipo, Lowry, Robinson, Morris, Martin, Strus, Vincent, Dedmon - Jovic
Heck even the Sixers have a bunch real depth this year
Sixers - Embiid, Harris, Harden, Thybulle, Maxey, Melton, Niang, Tucker, Milton, Korkmaz, Joe
Now obviously some of those guys are certainly equivalent to the end of Boston's bench and Boston has some better players in the 4-8 range than many of those teams, but they all have more overall depth than the C's.
Heck even a team with less talent at the top, like say the Hawks, has a ton of depth.
Hawks - Young, Murray, Bogdanovic, Collins, Capela, Dieng, Okongwu, Hunter, Holiday, Williams, Harkless, Kaminsky
or the Nuggets
Nuggets - Jokic, MPJ, Gordon, KCP, Murray, Brown, Rivers, Hyland, Campazzo, Green, Smith
Those teams just don't have the expense on players 4-8 in the roster like Boston. That is where Boston's salary has gotten out of hand. 7 players over 10 million and 4th most expensive guy at over 22 million is a lot of salary in the middle depths and more than makes up for the cheaper than many teams top 2 salaries that are Tatum and Brown. Turning someone like White into 2 or 3 cheaper players, would fill out the roster a lot better.