Yes. They will.
You’re assuming they won’t because they haven’t done a ton of it, but that’s because they haven’t had the personnel. Brad specifically talked about them acquiring Porzingis because he brings an element that the team just hasn’t had. To think that wouldn’t be part of the equation in crunch time is pretty silly. Thinking it’s just Tatum every time is you letting the eye test trick you, as his usage in crunch time wasn’t even close to most top guys.
Also, Tatum usually gets trapped at the three point line, not after he attacks, that would be the defense collapsing, which is very different. When he gets trapped, it’s swinging the ball and the rest of the Celtics players going 4 on 3 while the defense scrambles. But when they run action with Tatum and KP, which they clearly will, Porzingis can either pop, or roll. If you don’t understand how that brings a significantly different element to the offense, I don’t know what to tell you pal.
Also, just using plain three point percentage is pointless, because it ignores context. Last season, Smart was in the 85th percentile in three point shot quality, Porzingis was in the 2nd percentile. Two years ago? Smart was in the 93rd percentile, KP 3rd.
Porzingis is miles ahead as a shooter, whether you want to believe it or not.