The CPU in that 2016 released system is a 7000 series, which is not supported under Windows 11.  It's 7th generation -- Intel is about to spring the 12th, so it's effectively five generations old -- given that most notebooks have a market life of 6 months to a year at most, that's why it's no longer available. 17" 2-in-1 systems haven't sold well -- it's a niche market at best.   If you want another Dell system, you'll have to prioritize your requirements, since no one currently available system will meet all the requirements. The largest Inspiron currently available is the 7610, which has a 16" screen, but it's not a 2-in-1;  for that, you'll need to step down to a 15" screen.  And while you can still find systems that take two separate drives, they'll almost certainly be M.2 2280 drives -- not hard drives.  2.5" drives are a dying breed as far as new notebooks are concerned.  They're largely gone from the mid-market and support for them found in basic, entry-level systems and large-footprint gaming systems.  
HelloI bought the Inspiron 17 7779 laptop quite a while back.  It ticked all of the boxes that I needed then and still need now. 1. 2-in-12. Nvidia graphics card 940 or above3. Space for two separate hard drives4. i7 processor or aboveCan anyone give me some insight as to why this was discontinued or not available for Windows 11? There's literally not a single product from any manufacturer anywhere on the market that fills all these criteria. I wouldn't even care if it was 17". I just need the 2-in-1, dedicated graphics card, awesome processor, and space for two internal hard drives. Someone help a brother out?
Inspiron 17 7779, question about discontinuation