I disagree with your characterization of both Woods and Kupp.
While both of them are tremendous possession receivers, they both also have deep speed, especially Woods who's slightly faster than Kupp. Kupp, otoh, is slightly shiftier.
The issue was the reduction of the offense. Now, whether that was Goff's issues or McVay's hyperfocus on efficiency or any number of factors, I don't know and won't speculate here. But that change in offensive philosophy from "make them defend every blade of grass" to "we just need to execute and be efficient" radically changed the roles of our wideouts.
Basically, we could have had Tyreek Hill and the number of explosive plays wouldn't have increased all that much because it's not like McVay can't and hasn't schemed every WR as well as both our starting TEs deep.
With Stafford in the building, we're good with Woods, Kupp and Jefferson.
I would be upset if we walked away from any of them at this point.