Shame
On a more serious note though, most of the time the POV switch is also warranted by narrative reasons. One notable upcoming example is the Zone, where Shani will be on her own.
Z will be nowhere close, so the only way to experience it is through Shani's eyes, if you choose to do so.
If you don't, there's a strong possibility that you'll get a synopsis of what happened there upon her return but not a step-by-step rundown.
This unfortunately means that certain updates will feel shorter for players that chose to not follow Shani around.
Another potential side-effect of it is, it's
possible that Shani will be called to make some decisions in certain occasions so if you choose to not follow her, she will make those decisions on her own.
Of course this would be impacted by how Z tutored Shani up to that point so it will not be out of complete control of the player, but still something unable to control at that specific moment.
All in all, Shani will not become the centerpiece of DS in terms of "being the MC", it's still and will be Z's adventures by and large.
I fully understand the immersion breaking, but it's something that we feel adds to the game and Shani's journey was always planned to be sort of -if not integral- closely linked to the overall story.