If you're playing for first, the Bengals stack makes sense to me, if you're trying to not get last, diversifying is probably the way to go. If it's any type of keeper league or dynasty, I'm keeping Chase.
The Bengals stack could carry you to a championship, but you have to be willing to go down with the ship. I personally think I'd play the waivers for a QB until Burrow figures it out, so you aren't getting burned by both positions right now, but I'm keeping that stack. It's not bad value, I wouldn't fault anyone for taking it, and going from Chase to Diggs isn't giving up on Chase, but it's giving up on one of the rare stacks that could carry you down the stretch.
"If you aint first, you're last"