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For me, I just don't want to sacrifice battery life and/or my own night vision. I don't know if either of these are really an issue, having never used "down lighting" but I also don't see how they couldn't be to some extent.
hippy-
For the model of Seemee I have (300) the downlight is an optional mode, and there's a multitude of mode options for various degrees of power saving and rear / down light. Max run time is listed at ~200hrs which I've not been close to testing the limits of. They even have a little matrix for you to work out whats what (attached).
Re: night vision. My experience of this light is that positioning is down and behind enough that it's out of sight. In pitch darkness out in lanes or similar I'm sure it would be more noticeable. Kind of by the by ...red light is notoroiously A-ok for preseving night adjusted vision which is why a lot of modern head torches have red light modes.
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There is no antidote for cuntily not looking, but also not sure it tracks to be fatalistic about things that help mitigate risk in other circumstances.
What evidence do you need to see? Subjectively,I find the downlights on my Seemee work better than single source lights as they reflect on bike + me as well as demarking road space under the bike. Harder to miss is harder to miss, and I'm pretty confident this gives drivers more readily visual information about a cyclist (size, speed, direction, etc) but also is more obvious / discernable at distance and in peripheral views, at a glance, etc. I do not need a flawed study to tell me that.