Also I used to have a KAF8300 based camera. I think the ASI1600 will exceed it in performance for imaging. They key reason being lower read noise. You need much (30s vs. 300s) shorter exposures (although total exposure times will be similar but more subs) to generate the same SNR which equals much easier calibration.
30 seconds vs 300 seconds? I'd probably check the math on that to make sure you have reasonable expectations. There is no chance that is going to happen.
I don't think you read the full post. Total exposure times will likely be similar but you will be able to use shorter subs due to the lower read noise.
If you use a higher gain setting you can bring the read noise down to 1-2e. At a higher gain setting you will not use the stated full well of the sensor but that is irrelevant. You will use sub exposure times that fill the scaled up sensor well exactly. At that sweet spot you will maximize the extraction of every photon captured by minimizing read noise. The math on this actually works very well.
But the real benefit will be easier calibration and less subs (exposure time) lost to mount errors or satellite trails etc.
While still a high quality sensor the KAF8300 is a decade old technology. These new cameras like the ASi1600 will take some getting used to. The biggest challenge will be for imagers to get out of a 20 year old imaging paradigm driven by CCDs... which is the most challenging part.
I understand why some would want the ability to take relatively short exposures, but a decent mount can track well in excess of 600 seconds, and satellite trails can be removed with processing.
The downside to taking many subs to to get the same integration time as a single sub, is the greater storage requirement.
It depends on what SNR you are getting in each sub. If you are getting the same SNR in each 30s sub from a low noise camera as each 300s sub from a higher noise camera, then you actually do not need more subs. Not, that is, unless you want to get a deeper exposure. In which case, you still wouldn't necessarily need massive numbers of subs.