Im not sure what makes people think that the PBC isn't adjustable. It's advertised that you don't have to if you don't want to, but you can if you want to. The vent is not welded in place, it's adjustable. The rods can be taken out for more exhaust. There is even a guy that snipped out half the grates so he can cook on the grate and hang stuff at the same time. It's not a big deal.
PBC, Weber OTG, ECB, Vermont Castings gasser