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ha i knew somebody would suggest substances eventually so i thought of an answer in advance: "i don't trust chemicals in my brain" 
I don't trust chemicals in my brain either. Wish I could get rid of 'em all.
purely electrical signal transmission sounds good. no more "chemical imbalance"! elon, get on it
haha! well, maybe uploads / ems could be freed from the tyrrany of the physical substrate - - but i have a feeling they'd not be free from other constraints (memory fragmentation? uncanny valley? weird attractors in brainwave patterns? ...?)
I remain suspicious of the sodium and especially the potassium.
I think you should be careful with potassium, and, to a lesser extent, with sodium too
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