Because it has a different high.indika will make you sleep and relax your muscles lose will to live.while sativa will make your heart race panik and want to do stuff.
i dont agree with that sativas make you panic or make your heart race statement. i get the panic and discomfort from indica heavy strains usually. so it may be more personal than general. sativas will generally have energizing highs though i agree with that. i always get shit done in the house with my destroyer.
PDF | On Jan 30, 2018, Robert C. Clarke and Mark D. Merlin published Cannabis Taxonomy: The "sativa" vs. "indica" debate | Find, read and cite all the research you need on ResearchGate
I was a huge weedhead for 20+ years (not as much anymore but still smoke). I could never really tell the difference. More bro-science as far as I'm concerned.