I do not like the term "friends first" because it alludes to the relationship being platonic with romance being some random far off probability. I feel the more accurate statement is "building our relationship on a foundation of friendship". The latter statement shows that you are indeed in a relationship but are choosing to forgo sexual activity in hopes of building a partnership not founded on lust.
If that is the true sentiment being expressed, then I wholeheartedly concur that it is the best way to approach relationships. When you lead with the physicality, it is much easier to end up in a toxic situation. You need to learn your partner, understand your partner, learn how you communicate, learn how you resolve issues, and etc to understand compatibility.
Once that is complete, the physical will help strengthen that bond and give you that experience that only and your loved one shares.
