Don't convince yourself every new joiner is a greenhorn!
I know an experienced guy from a smaller type with long range experience joining on the 777. Why, because his current gig is crap so he might as well take a new rating and experience then see where he is in 3-5 years. The market will have changed again by then.
Me, I would but the money is crap and the hours too high. I guess I'm lazy then )