I salute your approach to engineering but that's certainly not how employers view it.
I am not saying that frontend engineering is trivial. It clearly has many overlapping and non-overlapping requirements. But they non-overlapping part is large enough to require dedication and specialization.
DevOps and DBAs overlap with backend but it would be weird for a backend engineers to call themselves devops engineers or database administrators because of that. The latter suggest specialization.
I am not saying that frontend engineering is trivial. It clearly has many overlapping and non-overlapping requirements. But they non-overlapping part is large enough to require dedication and specialization.
DevOps and DBAs overlap with backend but it would be weird for a backend engineers to call themselves devops engineers or database administrators because of that. The latter suggest specialization.