As a hiring manager, I was asked by agent about full stack developer. I am not a big fan of so-called full stack developers.
No one can have unlimited memory and time to be expert in all area. I am more interested in knowing what the depth one can go. Those average stuff can be searched from internet. Those experience does not demonstrate the critical thinking skills. Those solution, with high probability, introduces high maintenance cost down the road.
Being deep in one area requires perseverance and talent, those attributes will provide a foundation to long lasting solution.
Being a technology manager, maintaining different technology stack has a huge cost factor and segment team into small silos. The team effort will be lost. The tech plan and road map is missing.
I have read some job description that requires tens of unrelated technology. This kind of position really makes me thinking how effective the tech management is and what the team looks like.