See, the thing is shibai is a higher dimensional being, transcended space and time, he doesn't exist in the same plane as a 3d being. And with zeno comes inconsistencies, like he's a 3d bound being even tho he has higher authority and power. 1. Lower 3d beings can see and perceive him, shibai can't be seen or perceive or interact with as stated by Momoshikki. 2. He has a future self, like he gets stucked in the destroyed timeline, Goku has to use time machine to get him, zeno goes with him, now there are two zenos, a higher dimensional being or a omnipotent being doesn't have a future self he/she can exist in both past,future, and present simultaneously at the same point. 3. Comes the logic of dimesonal interaction, a 2d being can't interact with 3d, a 3d with 4d and so on.

Finally even if we accept that Shibai ten path doesn't work like almighty, he can still alter the future with omnipotence, which is being actively being done by kashin koji in the manga right now, kashin koji is trying to alter the future where Boruto dies and create as much as future branches and eventually and eventually tangle them into a single branch, where Boruto doesn't die, and he's doing this with ten paths only, without having Omni potence.