The thing is that you have different grades of oil

This I knew.

and US refineries aren’t actually geared towards the type of oil the US produces.

This I didn't know and doesn't make sense to me why it would be the case. I expected US refineries to be optimized for US crudes. "Drill baby drill" has been the rallying cry for the Republican Party for nearly two decades now. At no point did I ever hear them say "Refine baby refine" though.