If having no system photos de-legitimizes forum contributions in the view of some readers, then those readers are missing out (and being rather shallow).
i don't see that being the case. well founded ideas stand on their own.
OTOH if you have really strong or 'out there' statements or claims then readers will want to understand where you are coming from. and a system page can help with that. but it's not that important. time on the site and posting history has equal or more weight to a system page with pictures in my mind. there is a degree of earning your credibility involved.
signal to noise ratio if you will.