Not just Darwin - modern evolutionary biologists acknowledge the gap between (current) Darwinian evolution and abiogenesis. Not that there isn't crossover, just that they're distinct. Agree. My specific comment about Darwinian evolution was to counter the following claim: Darwinian evolution pointedly does not apply to pre-life. Additionally - as you mention - pre-life chemistry didn't have the ability to self-replicate. I certainly agree that principles garnered from Darwinian evolution might be applied to abiogenesis - but we have to be very careful there, lest we anthropomorphize (actually, I guess it would be biomorphize) those processes.