Every viva is unique, but expectations show that yours will not be a total unknown.
Expectations provide an outline.
“Vivas are generally like this and not like that.”
Viva expectations shape preparation and build confidence.
The set of expectations you build up are a structure based on regulations and stories.
They build certainty but provide no guarantees.
Expectations matter because they are far better than wondering “What if…?”
And expectations typically show that vivas are nowhere near as terrible or challenging as the vague worries and unverified rumours about what happens.
Read the regulations. Listen to the stories. Ask around.
Find a set of expectations that will help you work towards being ready for your viva.