> We can't just decide "upgrade tonight and go offline for a bit". So we have to engineer around this... But since we can't do a bulk update and force people to

> We can't just decide "upgrade tonight and go offline for a bit". So we have to engineer around this... But since we can't do a bulk update and force people to restart, we need to deal with different versions which impacts the code quality. This is pretty typical of almost any customer-facing software written these days. Every mobile app has this problem. Web apps have this problem to a lesser extent.