It's like little league out there for Ohtani, where the pitcher is often the best hitter on the team. In college I wrote a paper on division of labor increases over time and one of the examples I actually used was comparing the hitting stats of MLB pitchers from the 1900's to the hitting stats of MLB pitchers in the early 2000's: at that time Dontrelle Willis was the big two-way player, everyone was amazed at how the D-Train could hit for power, he was being used as a PH even, but his stats were poor compared to the average pitcher of a century earlier. Over time, people specialize and at high levels nobody is good at all the parts of playing baseball. Except Ohtani. Ohtani means I have to call up my college and retract that paper.
Pretty much the only thing he hasn't done is play elite defense and maybe he'll decide at some point to spend an offseason learning SS and win a gold glove. I wouldn't put it past him. The Athletic interviewed Andruw Jones who saw an 18-year old Ohtani play corner OF in Japan and apparently at that point his defense was elite.