I mean, that’s sort of what we’ve been doing. (Hi, OP’s coworker here.) We’re a bit unusual in that we release games on Thursdays. In our busy season, that can be every other Thursday, with an email and social blast accompanying it. In the past we’ve submitted and been approved on Wednesdays so our customers know they can often sneak in Wednesday night and find our release before the marketing blast. In future, our soft launch will be two days or more, I guess, but we will submit according to that three day buffer. It’s totally doable. The problem is we can’t market a new game until it’s available on all platforms, which we time on each platform to the day. Ie we know how long ahead of time for iOS and Steam, and we (until now) also knew when to submit for Google.
And a quick word on soft launch periods: It’s ok, it’s not the worst thing, but it’s not preferable itself. Hence the need for a timed release tool.