I rarely watch something off Netflix. And when I watch something I love watching in highest quality (4K HDR if available). If they'd let me pay-as-I-watch I'd be happy to do so, but I don't want to pay every month for a service I rarely use, and sometimes never for a few months.

Another reason is availability. Apple TV+, for some reason, isn't available in my country. I've heard great thing about Severance which is available only there. I can't legally watch it even if I were to pay it. I'd have to pirate it if I want to watch it.