Hi, I'm so sorry for you first impression.
Fieldsattach is a extension for help you make a administrator easy and fast.
The problem with the front end is than joomla not give a type plugin for render it. Only for a com_content -> article. for others places we need other ways for render the extrafields. BUT, this ways are more powerful than automatic form.
The overwrite template and fieldsattach API is easy and it's useful not only for fieldsattach, for every component in joomla. It's a general technique, for this with fieldsattach you learn a lot of things for use in others components.