This is a very important point. If Ayton can shoot the three, you no longer necessarily need a stretch four. You can literally get a guy who has never shot a three-pointer before and be fine, as long as he can defend, rebound, and score in the paint.
Three-point shot is huge for Ayton. He can already score down low- back to the basket and face-up situations. If he can hit the three, teams won't be able to sag off him, which improves spacing for everyone. Once they start running at him, he'll be able to drive to the hoop or take a couple of steps for a mid-range jumper. As long as he mixes it up and doesn't turn into a stretch five, his ability to hit the three will be a huge positive factor.