> You're still assuming it's not like sleep, and that you wouldn't be floating in a vat of chemicals/equipment that had an impact on your mental state.

I'll point out that the current two-process model we have for sleep pushes the brain towards waking up after a while; Process C (circadian) on a periodic basis and process S after the brain's need for sleep is satisfied. That would need to be counteracted. I'll also point out that there's some evidence that even a few months of sedation will cause lasting cognitive damage, e.g. https://www.nejm.org/doi/full/10.1056/NEJMoa1301372, yet sedation for years, if not decades, would be necessary. The brain is not a machine; it does not shut down when asleep or sedated.

> And you still shouldn't assume that death is preferable to solitary confinement or sensory deprivation.

It is, of course, a personal decision and it might even be said to be the ultimate personal decision. However, not understanding the implications of one's choices, as best we know them, is unwise, don't you think?