DA/SA absolutely SUCKs. A pistol needs one consistent trigger pull, first to last. A DA first “cocking shot” is almost a throwaway if an aimed shot is needed. Then the transition to following SA means another potentially erratic shot in the under-stress transistion.
Make it SAO, or make it modern striker-fired (Glock, Xd, etc) but forget that sucky DA/SA. Chuck those Berrettas in the trash barrel of military history.
I don’t see anything wrong with double/single action pistols.
When I had a P-226, the Decoker was the safest way to put one in a safe condition. If I knew I was likely to need it instantly, it would be cocked and ready.
If I was just walking along and might need it by some chance I would carry it hammer down on a live round. The DA trigger was pretty good and I could cock it faster by just pulling the trigger than by pulling back the hammer, and I would have a fair chance of hitting my target too.