It's a little silly not to acknowledge a number 1 WR.
Look no further then our Super Bowl final drive.
When the game is on the line, and you have to have it, the #1 guy is heavily targeted and heavily defended.
He is the guy that is best at getting open and making the big play despite position designation within the scheme.
It's a very real, and relevant factor in each game. Top WR's are schemed against all week.
Coordinators aim to shut them down. It can be a TE like Kelce, or even a back like Kamara that we shut down tonight, which was probably the biggest factor in our defense stopping the saints.
It does get murky when a team has multiple big time targets, such as the case with Kupp and Puka. Who is the #1? No one knows. Thus, the potency of our offense.
Coordinators don't only ask how the F or the Z will be covered within a formation and look. They also identify the go to players that are most heavily targeted on critical downs. Otherwise they are idiots.
Regarding Tutu, I think Robinson has proven he offers much more in terms of physicality and catch Radius among other things.
I agree with those that see Tutu best suited as a gadget player that can be a solid #4 WR. He has improved his stock this year but is not able to do some of the critical things Robinson has. Look at the TD pass today. Tutu doesn't have the length to make that catch.