Why people don't test development distributions

Not enough developers who know what they're doing. Plenty of folks running around trying to triage bugs and getting stuck, not so many folks who know how to code, let alone code well. If left to hack, they're more efficient, but then folks like me who want to learn and have patches to fix those annoying issues keep interrupting them going "hey hey can you upload this patch?" and breaking their concentration. Patch acceptance procedures are being streamlined to try to fix that.