Why Things Get Pushed Back
Ok, I'll preface this by saying I have a bit of experience with Python 3 (I'm studying to get a coding job & improve my life)
So let's take the event being pushed back:
It could be that they found a game-breaking bug when they compiled the final code yesterday. Something that crashes the game. Literally unplayable.
Now, a game like DBD could have THOUSANDS of lines of code. For reference, War & Peace, the famous book? Only has 1,225 pages. The devs could be looking through enough lines of code to fill 2 or 3 War & Peace books. Or more.
When it comes to crashing issues, sadly, most compilers are pretty general on the 'why' because the developers of the compiler can only know what anyone will use the code for in a very broad sense. Dead By Daylight is in C#/C++, from what I could find. So you have general crashing messages that may give a HINT of where the problem is. No one who made the compiler or created C# or C++ could have known to write a crash message that tells BHVR 'Oh. There's a crash because the game is trying to place Dwight out of bounds and overwriting crucial gameplay loops with his location data'
That vague error cuts down the code to search from several thousand to maybe a thousand..ish.
So you still have to search through hundreds, of not 1000+, lines of code to find WHAT is breaking and WHY. And believe me; sometimes why a line of code, or an entire process, breaks is very obscure. It's not always as easy as 'Someone typoed' or 'someone decided to make a list when a dictionary was needed'.
And even THEN, when you fix the problem, there's a chance that your fix broke something ELSE. Then you have to find where and why. Can you alter your fix? Or was your change 100% needed, so now you have to go find what it's clashing with & fix THAT? And now you compile again and your fix after the first fix is now breaking something in the animation code. Can you alter your second fix? or do you have to go diving into the deep end again?
It's nowhere near as easy as 'Find it and fix it'. Or rather, saying that's like saying 'Rocket Science is just doing math' or 'Biology is just learning how living things work'; You're over-simplifying to such a degree that you're all but wrong.
So chill with the whole 'Give us this or riot!" and 'We deserve compensation!' and 'Why was it pushed back!? RAGHALEHARBLE!'
If it was pushed back, it was because it was not fit to be played. And the fix can indeed take days or weeks. It's not as easy as hitting ctrl-f and fixing a few words.