Well, everything has its own pros and cons depending on the work we perform through it. When it comes to serverless approach, the fact is applicable here too. In few cases, there is a strict UPPER limit on the vendor control in serverless approach and this clearly MEANS more downtime and THUS losses. The loss of functionality and system limits are the other issues. Also, there is no dedicated hardware available for the serverless approach. Thus performance and security BECOME challenges at several stages. Sometimes customer errors can also create the problems. The new deployment, as well as MONITORING tools become the only option when it comes to switching to Google Cloud functions. 

Well, everything has its own pros and cons depending on the work we perform through it. When it comes to serverless approach, the fact is applicable here too. In few cases, there is a strict upper limit on the vendor control in serverless approach and this clearly means more downtime and thus losses. The loss of functionality and system limits are the other issues. Also, there is no dedicated hardware available for the serverless approach. Thus performance and security become challenges at several stages. Sometimes customer errors can also create the problems. The new deployment, as well as monitoring tools become the only option when it comes to switching to Google Cloud functions.