Aren't all of these metrics that try to capture the bottom end inherently flawed because we don't know what an acceptable "minimum standard" for a long term job

Aren't all of these metrics that try to capture the bottom end inherently flawed because we don't know what an acceptable "minimum standard" for a long term job is? For me, anything that doesn't pay enough to own property and eventually retire with some dignity is a "non-job"; which would put a country like the UK at >30% or so. It's not clear to me that there is a standard basis. Someone might think affording rent on a small room and food is OK. Someone might think raising a family should be possible.