No doubt, but he has to mix it up, to keep defense honest. Looking back on the season, the worse thing that happened was him to be able to make 35 footers in game action. At that point it became his focus, the big splashy play. Even though he had some lapses, as the season progressed Klay became the more consistent offensive player of the two. He knew when to drive, and when to take the 3. He let the game needs dictate it. He started playing 'basketball', chilled with all those flashy behind the back passes, etc. and went about his work.
Steph on the other hand, actually regressed, avoided the basic bounce or chest pass most of the time, using his offense to create space from 25 feet out instead of going north/south, and once the Cavs started trapping him off picks, shading him, he became ineffective. That's why Tristan was able to guard him so well, all he had to do was play solid lateral defense and use his length to contest Currys jumpshot, and in the oft times he did drive, he was looking behind himself not being super aggressive because of the amount of times his jump shot was blocked or altered.
Cleveland got in his head in the finals, but he actual gave them the 'cheat code' to do it by his perimeter mindset.