The problem is that the "life originated somewhere" concept is already a rather narrow (opinionated) view about these early processes and pathways that we don't

The problem is that the "life originated somewhere" concept is already a rather narrow (opinionated) view about these early processes and pathways that we don't know much about. There is on the one hand the (still very poorly understood) "pre-life" domain which is presumably a condition that may exist in various diverse zones in many planetary systems. On the other hand there is the (fairly well understood) science of stellar evolution, nucleosynthesis etc. that creates the conditions for "pre-life" and for possible "pollination". Panspermia is not so much a concrete idea of "fully formed" life going from A to B but rather exploring what kind of exchanges of "life-forming" catalysts may have happened over the first billions of years.