oh, yeah, i always build everything. i forget that it’s even possible to use the engine without source sometimes 
sorry
unity is huge for build time improvements for the whole enchilada.
a couple of weeks ago, i wanted to try a non unity build on my dev machine, and it completely cracked out my installation after running out of disk space on the drive that it was building on, i had to redownload my entire project from version control to get it back working 
IMO non-Unity build is superior, but if you ever have to build the whole thing, you’ll want it.