All existed models (ideas) of the universes described the process of formation. But all of them still NEED a beginning, which is unknown.
To this, one could say:
We do not know it, so we do not talk about it. Or
Definitely no. We go to work on improving out knowledge.
We don't have adequate tools or technology? We go to work on improving them first.
Sitting there in ignorant silence helps how, exactly.?
And most definitely no. Other possibilities exist.
"Something does not appear out of nothing" is a pretty good common-sense rule at the scale of human experience,
but as with some other instinctive truths "it ain't necessarily so" at the cosmic or the quantum level.
And it's precisely at these points of nature not following "common sense" that new and deeper knowledge can be found.
"Hot things gradually get cooler until they match their environment."
Not bad, but it doesn't work for iron.
"As materials get cooler they contract"
Not bad, but it doesn't work for water.
It beats either wallowing in "don't know" or constructing a neat total answer on insufficient grounds and clinging to that.
Mind you, "the invisible Pink Unicorns did it" covers everything and anything, and it's very difficult to disprove.