To those that say Mongo's lack of transactions are a deal-breaker in e-commerce, I'd like to know more about this perspective. Can you be very specific? We've

To those that say Mongo's lack of transactions are a deal-breaker in e-commerce, I'd like to know more about this perspective. Can you be very specific? We've been running production e-commerce sites for many months now and haven't encountered a major issue in the lack of transactions across collections.