"1. Often require vendor-specific language, or at least vendor-specific frameworks / extensions to a language"
...
"(1) is definitely not a concern for the FaaS implementations I’ve seen so far, so we can scrub that one off the list right away."
That point do not make any sense to me. You have to follow the AWS Lambda programming model which is specific to AWS Lambda, so either way you are tied to some libraries and patterns which are vendor-specific.
...
"(1) is definitely not a concern for the FaaS implementations I’ve seen so far, so we can scrub that one off the list right away."
That point do not make any sense to me. You have to follow the AWS Lambda programming model which is specific to AWS Lambda, so either way you are tied to some libraries and patterns which are vendor-specific.