No team ever shipped faster by keeping its options open. And the cost of being wrong has never been lower — most technical calls are cheaper to make, and cheaper to undo, than they've ever been.
The expensive thing isn't picking wrong, it's the months spent not picking at all. A team that keeps reopening the same argument has no momentum to lose, because it never built any.
Pick a direction, get everyone building, and change your mind when there's a real reason to.