Is align boring necessary

When the engine is align honed, the hone has to take material out of both the caps and the saddles in the block to make it round again.
That would move the crank center line slightly closer to the cam.
It's not very much, just enough to true all of the bores and make them straight.
Maybe envision a cylinder being honed, it takes equal amounts off of the bore on all ''sides'' to make it straight and perfectly round.