When trading down "doesn't work" it typically means that we as fans think the Rams should have stayed put and drafted someone else.
Since 2012 the Rams' answer has been: the guy we drafted has the same draft grade as the guy we could have drafted if we stayed put. If that is true (and I know it's a big if) then how is trading down a bad thing?
We can, of course, dispute whether Player A should have had a higher draft grade than Player B. But the point is that within the Rams' draft room they don't think they're losing anything by trading down.
If trading down truly fails it's because their draft evals are off, not because there's anything wrong with the concept.
AlbaNY_Ram