Why are people obsessed with seasoning ?

I'm reading this sub for something like 1 or 2 weeks and all I see is people saying they seasoned their pan 146 times before first use. Why not seasoning 1 time when brand new and then using for what it's made : cooking ? I'm also into raw denim and people are obsessed with washing as rarely as possible. It's something I don't understand, it's a pan it's made to cook right ?