The perks aren't great for someone with good card(s) already. Actually, they aren't great to the marginal consumer (who doesn't have any cards yet) either. Square's Cash App card gives 10% off at Trader Joes/Whole Foods/Kroger plus discounts at a host of fast food places, and can be gotten by anyone, even without a bank account or credit check or anything. The downside is its a debit card, the plus is that the rewards compete with A+++ credit cards.

2% is pretty good for a card with no annual fee. You can get more if you use a card like Chase Freedom and keep track of your spending categories, but I don't know of any no annual fee card with more than 2%. Citi Double Cash is the only other 2% card I know of.

IMO those kinds of things come out as less financial benefit than just getting cash back. The exception is for people who travel quite a bit.

For me personally, getting ~2% cash back on every purchase would be better than a moderate discount when I actually need to stay at a hotel.

Just depends on your situation.