But you don't seem to have made a compelling argument that such people are worse off than epistemic maximisers.

If we just consider personal happiness, then I agree with you – it's probably even the case that epistemic satisficers are happier than epistemic maximizers. But many of us don't live for the sake of happiness alone. Furthermore, it's probably the case that epistemic maximizers are good for society as a whole. If every human had been an epistemic satisficer we never would have discovered the scientific method or eradicated small pox, for example.

Also, discovering and following your terminal values is good for you almost by definition, I would say, so either we are using terms differently or I'm misunderstanding you. Let's say one of your terminal values is to increase happiness and to reduce suffering. Because you are a Catholic you think the best way to do this is to convert as many people to Catholicism as possible (because then they won't go to hell and will go to heaven). However, if Catholicism is false, then your method is wholly suboptimal and then it lies in your interest to discover the truth and being an epistemic maximizer (rational) certainly would help with this.

With regards to your romantic example, I also agree. Romantic satisficers are probably happier than romantic maximizers. Therefore I wrote in the introduction:

For example, Schwartz et al. (2002) found "negative correlations between maximization and happiness, optimism, self-esteem, and life satisfaction, and positive correlations between maximization and depression, perfectionism, and regret."

Again: But in all those examples, we are only talking about your personal happiness. Satisficer are probably happier than maximizers, but they are less likely to reach their terminal values – if they value other things besides their own happiness, which many people do: Many people wouldn't enter the experience machine, for example. But sure, if your only terminal value is your happiness then you should definitely try hard to become a satisficer in every domain.