Mac’s Second “daw” Account For Music ? Options

[Milca]

I have Power MAC Dual G5 2,7 GHz
It’s important to note that since I’ve made some big mistakes as far as handling my apps I’m doing “ erase and install” on my boot drive ,purchasing new boot drive and starting from the scratch - Basically doing whole new setup with my music apps,sample libraries and back up.
Since I want to do everything right this time - I was gonna ask about following issue
I’ve been going through some research and in couple of places I’ve read that many people sometimes using two accounts
- one for music - DAW account and
- one main account - for all the other activities
I’ve also found out that there are two different opinions on what this set up can do for you.
First group claims that this set up allows to keep your DAW system clean and that there are also performance advantages.
Second group claims that this is clearly for organizing purposes and that won’t probably win you any performance = they also say it might be time consuming to customize your system this way.
If anybody have any experience with this two account system - please let me know.
I would really appreciate your feedeback
Milan