Regardless of the pressure, trying to meet all your emotional needs from one person does not mean that every adult affair finder wants the intensity, responsibility or expectation of a more traditional commitment relationship. Being a good friend means literally: you are mainly friends, and there is a sexual element in your friendship. There are many people who are good together, both emotionally and physically... As long as they don't want someone to have this relationship with your boyfriend or girlfriend. Just as we don't expect our platonic friends to be the focus of our lives, fwbs combines a certain degree of familiarity and intimacy without making your relationship the core of your world. This doesn't make people who want FWB relationships selfish or self-centered; it just means they understand the relationship that best suits them - both now and in general.
On the other hand, it's not monogamy, monogamy or old-fashioned unconditional marriage to have a friend of interest. Although, yes, most fwbs don't have expectations of monogamy, that doesn't mean it's just wrong. Most people looking for NSA relationships want a partner they can trust. While trendy tastes are intoxicating, the combination of familiarity, comfort and trust makes sex amazing. Women, in particular, benefit from an average partner who is more likely to really care about her happiness in this kind of date.
While some people may be cool about a "no talk, just head" relationship, even people who like to sleep with a lot of other people don't always want to have a bad vacation. In friendships where sex is just a part of a relationship, it's usually ideal. However, in both cases, the conflict between expectation and reality will lead to dramatization. Many people use FWB relationships as a "just need to remind" strategy to entice an unwilling partner to make a commitment. Many people see friendship as a dependence on their interests, which hurts their partners. They just want to have sex and are willing to bear all the costs. Once sex is no longer a choice - for whatever reason - friendship breaks down. You may never be happy, but that doesn't mean you'll feel at home with other people's feelings. If you want to find a good friend, make sure you and your friends understand what this means.