Hate to throw a variable into it, but I usually spend less than 50% of my income (after savings and retirment), and I still use BNPL and payment plans when I can get interest rates and fees for under 10%.
Also, people are chronically up in arms about taxes, but here, they are signing up for voluntary taxes on everything. At least taxes buy something real, like roads, mostly reliably safe food supply, education, police, fire defense, etc., while interest just buys indulgence today then headaches tomorrow.
Interest is fine if you are creating an asset that create greater future value (e.g., building a business), or where the asset itself is a security (e.g., a house). But for transitory consumption, debt is a losing game. (I'm distinguishing debt from credit cards as a payment convenience paid every month - don't let them slide)