From my personal experience:
I have lodge a student visa subclass 573 then included my de facto partner. But because of that we were both interviewed by the embassy and after 3 months of waiting we got denied but it was due to GTE reasons (sabi daw nung CO konti lng daw nalalaman ko about my uni and australia but the de facto was okay sana).
So I lodged again this time student visa subclass 500 na. The agent suggested huwag na isama yung partner ko so ma assured muna ako ng visa then I can include him after I got my own visa. So I just included him under non-flying family member. After 4weeks I got my visa!
I am already here in Melbourne Australia (Feb Intake) and now I want him to go here with me as previously planned. Kaso I am not sure if I want to engage with the same agency since ang mahal ng singil nila.
I already have my defacto evidences like:
2 Joint Bank Accounts (2 years)
Joint Gym membership
Local Authority registration under the same address(cedula, brgy clearance, nbi, police checks)
Rental Agreement
Travel tickets
Letters from each other
Photos
Stat dec from family and friends
Proof of communication with each other (VIBER, imessage, skype)
GTE statement nung partner ko (why he wants to join me in OZ)
I was thinking if I need to look for another agency or mag DIY nalang? What other evidences I might be lacking na makakatulong.