Success triggers in missions needed

[Michi.G85]

I flew a Apache Mission lately, destroyed 15/15 targets, landed on the FARP - but the mission was still 0% successful.

That's pretty annoying tbh.
Why do you guys design a complete mission but leave the successtriggers out?
There are so many missions with this problem in SP.

All I want is to see a "Mission successful" message after doing my job.
So at least I know I did something right. Thats pretty frustrating, especially for new players...