I have over 120,000 developers who subscribe to my e-mail newsletters and I suspect most subscribers would not consider them "Promotions." Hopefully those who care to read every week will drag them back into the main inbox but I imagine some will fall by the wayside. (Not that I'm panicking, I'm not noticing much of a/any drop in open rates at all.)
I don't want your sales-funnel emails full of doublespeak and marketing buzzwords.
You think your email is full of helpful info about your product but it's not. It's just spam.