Well, as the complete idiom goes:
A jack of all trades is a master of none, oftentimes better than a master of one.
I tend to agree with this. Being a specialist is commendable for sure, but it certainly leaves those people wishing, perhaps subconsciously, that they had delved into other things in that time, instead looking somewhat foolish when they try and saddened that they feel so ignorant about the rest of the world.
The generalist like yourself - a dying breed - will have such a wider set of experiences that they're gonna be more interesting to be around, more empathetic and just more useful!