it just put the movie into chart
nothing being explained :x

How does time work actually in the vastness of space..Does Thanos use the same kalendar kuda on Morag and Vormir?

So Cap was living in another timeline until old then go back to his original timeline.

That means he stole the shield from the other timeline!

Captain America & Peggy Carter back in 1945 could be a new timeline too.

From this theory, did Cap really get married to another Peggy from another reality?

Since that reality's Cap, which at that point also probably frozen, will definitely also love that reality's Peggy, does this world's Cap really had any business there except to intrude into that dimension's Peggy and Cap relationship? What happens when that reality's Cap is woken up? Wouldn't he be also looking for Peggy as this reality's Cap also did?

While that reality's Peggy still looks, feels and acts the same, she would definitely still be a totally different person to this reality's Peggy.

Is what Cap is doing morally defensible?

so where is the timeline that Cap stayed back to find peggy and live to the reality?

did not captain met his frozen self back then?

don't think so. if steve growing old with peggy is a new timeline, then he would reappear on the machine and not the bench

this

i thought the GPS is for the dive and not the return?

Flawed.
Why is there only 2 different timeline?
Who ever said there was just 2 timeline?
When they entered quantum realm, there was 3 different destination at 3 different time. Surely they all went to 3 separate timeline. Then Cap and Ironman went back to 1970. Thats a different timeline altogether.

In total, there was 6 different timelines involved. 7 if you include 1945.

It is strongly implied he went back in time and stayed in this timeline and when he was older, he simply went back to the time and place where he originally went into the past and waited.

I think QR was the means they access the past
There is no QR timeline.
they go through the QR get the stones from the past and put it back. If they mess the past too much it forms a alternate timeline/reality/universe

They go through the QR not into the QR

How did he become normal size again without the platform?
When cap returned without the stones and hammer. Was his shield with him? Damaged from battle right? He repaired his broken shield or did he steal another one

then he'll still need it to unshrink right?

Their reality as in from 2012 ancient ones pov.

Because after banner takes the stones the timeline branches to form a new one where time stones don't exist.

So in that new timeline they can't fight against dormamu for example unless banner returns it to its original time/place which in turn ensures the timeline doesn't branch off.

At no point is the fact that quantum time travelers can independently, without the use of the time machine, go to another time point from where the time machine sent them originally is even discussed.