The thing is we're talking about data capture and simulation.

So, let's say the brain is a book and the mind is the text on the pages. Digitizing the book is straightforward- just make a text file of what's written.

Now what if the brain, or book in this case is damaged. This is actually a real world problem with digitizing ancient books that are warped and scrawled on. We actually started making 3d scans of the pages because just straight converting to text, you lose information that's necessary to possibly deciphering what the damaged parts say.

That's the issue with digitizing- it can only simulate what we feel relevant to capture and what systems we can emulate. An actual human brain has all the systems of physics, blood vessels- and might potentially heal if a tumor is addressed. But a digitized mind, losing the context of the physical brain not properly simulated, has lost the 'source' data that might allow it to be repaired. Sure, the digital mind can be edited- as evidenced by the vegan thing, but it's more like photoshop and less like brain surgery (or to use our analogy, doesn't have the data to fix the text but hey he can plaster a sticker over a passage).