I don't think it has to be so black and white. There's room for a variety of small preferences to cause a person to choose one thing over another.

Going out to eat may be tastier, but it's generally more expensive. When it's not more expensive (than Soylent) it's often to some degree a mixture of the following:

1. Not vegan

2. Not tasty anyway (i.e. fast food)

3. More time consuming (the place that you like is far enough away)

I'm certain you can find other potential reasons.

Each of these may affect different people for different reasons and to different amounts (e.g. some may not care about vegan).

Ultimately, it's up to each person to decide on their own personal preferences, and the weigh their own perceived costs. For some, that may result in Soylent being a preferred option for some meals (these preferences are dynamic). For others, it's never a preferred option. That just seems like part of being human, to be honest; no sense for either side to get upset at the other.

No, I don't think you can generalize like that. I like eating just fine, but I would consider Soylent if I wasn't married mostly because I just don't like cooking. Going out or ordering isn't financially all that feasible, whereas Soylent actually could be.