The point with Hey is about privacy and the approach to email.
The flows are designed to optimize the time you spend managing emails, compared to standard email clients that over the years optimized the flows that have been there since forever.
I think a lot of features from other existing clients are not there because they don't need to be at all. I wonder how many of them we miss because the classic approach to email vs what Hey proposes.
I am not a hardcore email user. I am totally fine with Gmail. I will pay for Hey because of what it stands for. If I eventually fully migrate, time will tell.
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We strive for transparency and don't collect excess data.