Because Şengün is a great passer and can play the post. Gobert's strengths are different. I think the offense could work reasonably well but it would definitely take a hit if it's Bogey you are moving. The defense would also take a hit if it was Royce. I don't think Jazz are a good fit.Wood plays on the perimeter. He plays minutes next to Sengun right now anyway. Wood next to Gobert would be like Evan Mobley next to Jarrett Allen.
Wood and Mobley aren't similar at all. Especially on defense.