That ignore the biggest issue that lambda has at the moment. Throttling. Concurrent executions are throttles at a (account) regional level, which means if you

That ignore the biggest issue that lambda has at the moment. Throttling. Concurrent executions are throttles at a (account) regional level, which means if you have 10 different lamdas and 1 of them eats your entire concurrency limit by executing constantly it effectively DoSes the other lambdas such that they are unable to execute. This may be fine if you are small, but many companies run shared infrastructure and all it takes is 1 misbehaving lambda to paralyse your entire region.