> At the end you have DRAM that you cannot read from or write to at all because it’s always refreshes itself.

Be so kind as to run the math on this for me? There must be something that I'm missing, because it looks like you're describing a system in which a refresh causes so much disturbance that another refresh is immediately required. Such a system seems incapable of reliably storing a byte and reading it back. The colloquial term for such a system is "unreliable garbage".