I'm planning to build a firepit area on a corner of my backyard. My initial thoughts were to have an L-shaped (or even semi-circle) concrete bench without back support and with some green behind the bench. This is what I have seen around in many pictures and I quite like the visual. Seems to be trendy. However, thinking through this, my concern is that without the back support, the sitting position may become somehow uncomfortable (after a couple of hours) and I'm now having second thoughts whether I should go for a bench with back support (concrete with some cushions) instead. The visual may not be so attractive but functionally speaking, it may work better. Anyone has a view either way ? Thanks