I think more important than the serverless question (and btw I agree with you, I I lean towards it not being a good idea) is whether they are wearing "Vendor tinted glasses".
I tried hard to think of advice on how you may remove the glasses if that is the situation here, but in honesty it is a tricky one. It is akin to a little worldview; bubble, and those are tricky to try and actively shift in others (an attempt at a suggestion: I think perhaps it would be best to come into team discussions around this not as being on "one side" but rather as being the reasoned, dispassionate expert on all sides; the whole question).
I say this is someone who up until recently wore the glasses (in my case it was for Kubernetes) - it took me a failed project to take them off, I hope that does not happen to you.
I tried hard to think of advice on how you may remove the glasses if that is the situation here, but in honesty it is a tricky one. It is akin to a little worldview; bubble, and those are tricky to try and actively shift in others (an attempt at a suggestion: I think perhaps it would be best to come into team discussions around this not as being on "one side" but rather as being the reasoned, dispassionate expert on all sides; the whole question).
I say this is someone who up until recently wore the glasses (in my case it was for Kubernetes) - it took me a failed project to take them off, I hope that does not happen to you.