3-Statement Modeling in Practice?

I work at a small boutique, so things are obviously done differently, and we do a large amount of buyside advisory. The weird thing I've noticed looking at resume templates and preparing for interviews is it seems like 3-statement models are the norm.

We have never built a full 3-statement model before because it never seemed necessary. Capex and NWC for example were always quite low and not a large part of the picture, so we just made simple assumptions based on what target management disclosed. Is this par for the course on buyside transactions or are actual 3 statements actually standard?

I ask because I am going to interview soon, and am a bit concerned that I've never done 3-statements before outside of training.