@Marindor, Now there is were the problem lies.
As a developer you may have considered the side prizes as filler but as a player there are instances where we did actually get excited about the side prizes. In fact I see the side prizes in some cases more valuable than the daily prizes. It gives me an opportunity to "stock up" on valuable resources for the game.
As several players have mentioned before some side prizes are considered as "trash" while others are actually quite useful. This is also where the strategy comes into play instead of just dumb luck.
With the 3 chests you could look at the contents and calculate the odds of getting a daily prize versus what you call filler.
With my game play (and I am sure many others do this as well) if I see a chest with good odds of getting the daily versus the other chests but the filler is truly trash then I will go for a chest that has what I consider "more valuable" filler.
The perfect example is if the chest has Magical Manufacturing I will not pick it under any circumstance as I do not need or want anymore of these. I can create as many as I want cheap enough in my level 5 Magic Academy and I rarely use them in the first place.
On the other hand if I see a chest with filler that are time boosts I am more likely to take them because I happen to like time boosts.
THIS IS WHERE THE STRATEGY COMES INTO PLAY. I have a choice to move my odds in favor of the type of filler/side prizes that I want instead of just blind luck. This actually takes some thought process. This is how a player plans out their game play strategy.
Other players view trash and valuable filler differently and will make different choices than I would make.
All players value the ability to make choices that actually change and direct their game play.
THIS IS AN IMPORTANT CONCEPT for a good game to survive. You start replacing the ability to make choices with random luck and the game slowly deteriorates and fades away.
The new mechanic is just dumb luck. Why even give us a choice to choose from. In reality you could just as easily replace it with a single button that says "random prize". There is no strategy involved at all. It is all just random luck.
This is what we as players are complaining about. With all of the changes that you are making you are slowly moving away from a player directed game to one that is driven by game developers and luck. You are taking the skill and fun out of the game.
Yes you are making all players equal where player skill and choices no longer matter anymore. Is this what you really want. If that is the case just give us one button marked "Next move" and be done with it.