There is a new luxury tax out there.
Plus (this is a big one), keeping the money down in certain locations allowed the Celtics to use the full MLE vs. the lesser MLE.
To me, the question is whether the new luxury tax will keep the C's out of the stratosphere going forward, and whether the multibillionaire-owned (e.g., Dallas, Brooklyn) and biggest media-market teams (LA, NYC) will be in their own orbit ever after.
The C's won't be down in the small-market band, but they may not be up at the major-market level either. This may be the first year of a 'new normal'.