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I have Blue for several years. I got it because it was a revolver. Seldom use it as cash back is more compatible wth my use now. It is (or maybe was) possible to use the convered MR rewards to pay for an item on a current statement if the MR to cash conversion equals the exact amount of the charge to the penny. I have not tried that lately so not certain if American Express still offers that.
Also, reconsider the "foot in the door" approach. Go for the card you want, when you expect to be able to get it. There is little real evidence that having a foot in the door makes much difference, and you end up with a card you don't really want.
Isn't the Everyday better than the Blue in every way? Both no AF, Blue earns 1MR per $, Everyday has a bonus category (groceries) and with 20 uses a month, earns 1.2MR per $ everywhere else.
And I remember Blue used to be worse, earning MREs rather than MRs, till MREs went away.