Well you can't say that their roster is so stacked that they can just relax and pick whoever.
A great example of why they shouldn't have picked Robinson is the guy they already have - 5th round pick last year, 1000 yards rushing, 4.9 yards per attempt. Robinson is a bigger talent than that guy, but who really cares? You don't need a big talent at running back, you need a guy who can hit the holes hard for 3 years, then you cycle in a new one once the old one is run down. How much more can Bijan offer than the guys they already have? Than a random free agent that they sign in July?
The last time a super bowl winner had a big time running back was... umm... hang on, going back a few more years... uhhh, Willie Parker (who was undrafted btw)? Corey Dillon? Over the hill Bettis? The best answer is probably Faulk in 99. Running backs don't matter. I say this as a Giants fan who's been watching Saquon for years.