IMO there is a basic hierarchy on the 3-point shot:
1. Corner 3s > Above-the-Break (ATB) 3s
2. Catch-n-Shoot (C&S) 3s > Pull-Up 3s
3. Wide-open 3s > Tightly Guarded 3s
https://www.nba.com/stats/team/1610612738/shots-dash
Obviously, certain players excel at different spots. Jrue (62%)/Hauser(52%) from the Corner is the highest value 3 on the Celtics (for example, Jrue Corner3 > prime Abdul-Jabber hook shot this season).
The Celtics should use the shot clock to find a GREAT shot. Besides a dunk/lay-up or KP post-up they should be hunting for Corner3s, C&S3s, & Wide-Open3s.
Disclaimer: Time, score, and situation also dictate FGA.
When Tatum shoots early shot clock 3s from the right side ATB (especially PU3s) it's a WIN for the defense. It doesn't keep a defense "honest", help any other shooter, or exploit any kind of statistical offensive anomaly for the Celtics (YMMV). With 4 teammates on the floor, that can ALL shoot, there are at least a dozen better FGA (he doesn't share the floor with TL & Smart anymore). Lastly, if it's late in the shot clock Tatum is excellent at getting shots off (rarely gets blocked from 3 + draws fouls on 3s) which justifies a PU/ATB right-side 3s.
The point
@tims4wins and I are making is this record-setting offense will need to be disciplined to win a Championship and continue to take Great shots over Good shots. CJM will have a few things to work on/point out from G1 to improve on which should keep them focused,
so all is good after the Celtics' wire-to-wire 20-point win