Because a security engineer focused on cloud would rightfully say "pod security is not my issue, I'm focused on protecting the rest of our world from each pod itself.". With AWS as example: If they then analyze the IAM role structures and to deep into where the pod runs (e.g. shared ec2 vs eks) etc. then it would just be a matter of different focus.
Cloud security is focused on the infrastructure - looks like you're looking for a security engineer focused on the dev side.
If they bring neither to the table then I'm with you - but I don't see how "the cloud" is at fault here... especially for security the world as full of "following the script" people long before cloud was a thing.
Oh yeah I see...
As some old philosopher once said: "shit's fucked, yo".
Seems to be appropriate here.