When my business pays for my travel the CSR is still useful. I charge the CSR and the company reimburses me. If I get a rebate, great. The company still reimburses me.

Benefits where you have to change your behavior have reduced value. The great thing about the CSR benefits is that they are flexible. The travel credit is just that -- credit on travel. Any travel. Airfare, airline incidentals, hotel, 1 ticket, 2 tickets, 6 tickets, round trip, one way, taxi, lyft, uber, car rental, public transit... it doesn't matter. All get reimbursed. If you don't pay incidental charges on airlines you can still use it. Hell, if you don't fly you can still use it!

PP restaurants get you a free meal no matter which airline you are flying. The delta lounge access is only good if you are flying Delta. How can you compare the two? One is an actual benefit to you; the other is an attempt to drive your business to one of their partners.