I feel a bit ashamed to say this, but as a polymath, wasn't Tagore's specific knowledge limited compared to Einstein's, who had been doing distributed work sole

I feel a bit ashamed to say this, but as a polymath, wasn't Tagore's specific knowledge limited compared to Einstein's, who had been doing distributed work solely in scientific fields rather than spreading his knowledge thin with political matters and theology? Obviously the conversation in question doesn't involve much science, but if Tagore did have the scientific stature to debate Einstein with concrete detail, one could wonder why the conversation seemed metaphysical rather than concrete.