I can't count the number of times I've gone up to two soldiers standing next to each other and am only able to take one out silently because combat is triggered before I get the prompt to take out the second. Usually this results in the surrounding soldiers rushing in turning a stealth attempt, again, into a melee.
This worked so well in previous games like AC 2, 3, and Black Flag. You could even do a rush takedown on two targets which looked really cool. I know this feature was removed in this capacity with the rework of the game in Origins but at least Odyssey gave us a chain assassinate.
The current implementation of double assassinate is fun and looks cool, plus I like the range option, but it doesn't work for stealth. Bring back the ability to take out two targets at the same time without triggering combat.