Are you even playing the game? There is NO 35 day shield!!!
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You can get up to 13 IIRC days continuous shield by buying them in the sequence below allowing for the initial cooldown periods:
2 day
1 day
7 day
1 day
2 day
Yes, I agree, the goal was to maximize revenue, by increasing the sale of shields.
I do not agree that SuperCell understood this would break gameplay at or above 4800 trophies. They were so shortsighted in their focus on the revenue from increased sales of shields, it blinded them from considering the next impact, which is a net-loss in the number of players available for defense.
I also disagree that SuperCell had any specific and coherent expectations (supported by a solid business case) which they designed against. I am of the firm opinion it was knee-jerk, driven by their desire to result in a 90-day revenue infusion, and impress via their coding skills. This, as opposed to a thoughtfully and thoroughly planned set of business and revenue goals, backed up by a series of supporting development projects.
I mean, after all, this is the company that is purposefully breaking many pre-update game play components to reign in customers, who have made them millions, by using the product wrong.