If I were to attempt to answer the question I would say...
Yes? But more a mating of souls, a combination of two into one, a forfeiture of individuality, & perhaps there are only some people that we are willing to do that for, & perhaps, also, we can find those people through a mere alignment of the eyes. That moment which is often described, seeing someone from across the crowded room, perhaps that is simply romanticism, but perhaps there is also some truth to that, or perhaps this love that burns in the soul is built, or can be found anew in something old, a person you used to know, or wished you had.
Perhaps it is found differently for each, in a conversation, or through a series of conversations, maybe both sides are too shy, or initially indifferent to one another, or any of many different circumstances, and maybe this love can be found in many individuals, out of the billion that live, but still a very small percentage of the whole, like 0.01%, or something close to that.
But to me, a 'soulmate', the ideal of love, is something which both people commit to being/creating, it's a kind of love that both choose to participate in.
What makes this love rare is the minuscule amount of people willing to make the sacrifices in order to search for, discover, hold onto, build up, & sustain such a relationship , also the circumstances surrounding, the concerns of the individual, & many other things, but I think this love exists/can be found/created.