Typically "astrophotography" cameras are more aimed at deep sky use for shooting nebulae etc with the removal of low pass filter that's responsible for blocking off a lot of the Hydrogen Alpha signals that are found in a lot of nebulae. With shooting deep sky pending on condition (whether or not you're in dark sites) your exposure could be shorter or very long. With longer exposures your sensor heat up and can cause (dark current) noise which can be alleviated with dark frame subtraction whether you let the camera do it by itself (long exposure noise reduction) or take the dark frames yourself and use that to subtract the noise later (which astrophotography specific software does it automatically). Regardless of your single frame exposure time you'll be taking plenty as more data the better (also pending on how bright your object is).
I shoot Milky Way landscape and dabble in deep sky and I'd probably still prefer to use stock camera for MW landscape due to having to correct the colour after but for deep sky with a modified camera no doubt (which I have a 77D for).
Here is an example of "deep sky" astrophotography of Antares region taken from my suburban backyard with my modified 77D (with a total integration time close to 2 hours off top of my head):
Antares Region by
Tony, on Flickr
Here is a typical MW landscape with my stock 5D4 and Sigma 14mm Art (on an entry level tracker):
Milky Way over Lake Moogerah by
Tony, on Flickr