I heard of these fellowships and likely it is always good to get extra training.
However, getting a job just doing thyroids, paras and adrenals might be tough. Lots of other people in line since for most general surgeons these cases are the grand prize. Maybe academics? But prepared to do alot of other gen surg til your referrals solidify or your senior partner retires.
Cant recall seeing too many recruiting ads for endocrine surgeon, maybe someone with more time than me can find and post an example.
Who doesnt like doing a nice thyroid? Technically it gives at least a mild challenge, cool anatomy. Very little complex postop care. One of the few perfect cases.