I feel like this is a false dichotomy in the real world anyway. At almost every agency I have worked for we have had both types of clients, and a spread inbetwe

I feel like this is a false dichotomy in the real world anyway. At almost every agency I have worked for we have had both types of clients, and a spread inbetween. Some are on retainers for ad-hoc support, some are under constant feature development as that is what the business demands, and some we put together and handover to the client complete per a spec. We don't even use scrum/agile on every project, some just have really light weight agile scaffolding, some we do waterfall if it's small and the client doesn't want to participate in the goings on. It isn't one size fits all in software dev, clients have various situations and expectations you have to meet.