A reference site is intended to give you kind of a "kickstart".
As such, those sites include several pre-made post types, fields, taxonomies, and so on, along with content.
Then, you can either develop your site directly on top of such a reference site, or just check and learn how it's built, and then use the knowledge (and eventually modules, exports, and so on) to do your project.
What you ask for would work, but it's not productive.
I would suggest to use the Reference sites as a local development "sandbox" and use them also to try things out.
The real development of the live site should be in a clean as possible and minimal as possible site, so there is often no need to install a whole reference site unless you plan to build exactly what one of the many Reference Sites offer.
Often it's enough to get this module from here, and that module from there, to achieve your projects.
Now, Avada is quite a Theme 🙂
I personally always prefer the way of "less is more".
This is a personal preference of course, but I like to develop a Theme for each project, starting from a minimal Boilerplate like The Starter Theme, or if you like, here I share my personal Theme, you can do whatever you like with it:
hidden link
It's fully Toolset Compatible but not our Official theme, so we don't provide debug or support for it.
I would pick Toolset Starter or the above theme, not Avada, as that one is simply too much for my projects.