You choose an example in which you can still see both signals on an oscilloscope with very little memory. Set the bitrate to 1Mbit/s (100 times higher) with a much higher packet rate as well and try to do the same with the top zoom window set to 5ms/. You'll see a contigous colored band. If you set the zoom window to 50us/ in order to see the packets a Siglent scope will shorten the memory depth and there is nothing you can do about it. You have a choice between either having long memory but not being able to see the packets in the zoom window OR seeing the packets but not have deep memory.
No it won't. I showed you example from my Pico where I sampled 100 MPoints in 200ms and shown it zoomed in to 20ns /div, zoom factor of 1M X. Yes, one million times.
Tautech posted one image above, where he got 50 MPoints at 20 ms/div (200 ms total) and is showing details at 20 us/div.
This is how it works but you don't seem to understand. On main timebase you grab big chunk of data, and zoom shows a subset of that, in such a detail that is only defined by sampling rate. Which will be limited by memory size.
But zooming in won't change anything from how timebase and sampling is set, only what are you looking at.
So you enable 100 MPoints, set timebase to use all 100 MPoints, and you can zoom in to every single point...
And zoom will not shorten or change anything.
What are you saying is SIMPLY NOT TRUTH. Just look at the overwhelming evidence shown here..