With stages being designed for hi-cap in mind, upping the cap to 15+ makes sense. 15 even is enough to force reloads anyways. And I say that as someone that shoots Prod as their main.
Low-cap on a hi-cap stage is boring as hell- run here, stand still, shoot, reload, run here etc. Might as well have a series of start boxes since lo-cap is about risk-management/not taking risks. Might as well just shoot an all classifier match. I would suppose if stages were designed with low-cap in mind, it wouldn't be that bad, but I am not going to ask stage designers to volunteer even more of their time to do so.
If people want to shoot lo-cap then go shoot Single Stack. Hell, low-cap is even implied in the name.