Sudo for sbin folders?

So I was testing different desktop environments on (kali) Linux, and I noticed, besides how it looks, it also changes when to use sudo before commands.

With a clean install on both machines with everything default:

XFCE -> have to use sudo for ifconfig

GNOME -> dont need sudo for ifconfig

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After more research I found that its the complete sbin folder..:

XFCE -> have to use sudo for sbin folder

GNOME -> dont need sudo for sbin folder

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Both machines have indentical sudoers file.

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First of all why dont I need to use sudo on GNOME for sbin programs? Bc sbin need sudo right?

And secondly I noticed a lot of people online just use the command 'ifconfig' without sudo. So they propably dont need to use sudo for sbin programs. Isnt this weird? Reference to first questions.