I'm no sure how things are now, but 15 years ago (back when I was doing network admin type stuff), most routers did destination routing in hardware, source rout

I'm no sure how things are now, but 15 years ago (back when I was doing network admin type stuff), most routers did destination routing in hardware, source routing hit the CPU and was thus, very slow. I think that was the primary reason not to do that back then---perhaps it's still the case now?