So much love for this; 'Every piece of complexity you incur should be proven as required', plus 'Fewer pieces in the technology stack is better, because each piece is operationally expensive'. Also, this totally ignores (as these, imho are enough in themselves) the actual practical differences between using a single thing and two - synchronizing state; most of the cases here guarantee atomicnes individually, but not as a pair - you (the engineer) have to deal with that - which is non-trivial.