The default rules support healer-less play just fine.
I prefer a grittier (but slower encounter per in game day) style, so I do not use the default rules. My PC's recover no hit points during a long rest unless they are at a plot designated safe point (an Inn for example). Each long rest they recover con mod HD (minimum 1). It's working fine so far, if it scales poorly I will re-visit. Two members of the party are capable of healing (ranger, bard) but neither functions as a dedicated healer. In combat healing, or indeed even stabilization, appears to be considered, at best, a last resort option.
P.S. If you do not wish to discuss something, then do not make it the basis of your argument.