Regarding the OP, I agree with the overall point that the utility of CSR has diminished over the years. I also have Amex Plat, and it has been a greater value to me.

The main reason I still keep the CSR is the 3x points for all travel. I use Amex Plat for all airlines charges [5x], but I have substantial other travel charges (condo rentals, cycling trips) that qualify for 3x points. Also, the trip cancellation/delay coverage is generous ($20k per trip). And I like how United is a points-transfer partner (no United for Amex).

All of the above makes CSR worth the net $250 annual fee, but it’s getting less valuable to me.