No, I just wouldn't make the assumption in general.  Very few BGAs I've seen have had some thought put into ease of routing it out. Many of those are assumed to go onto 6+ layer boards with blind vias the norm, not the exception, and the internals instead designed to make life easier at the silicon level.

iirc, the RockerBox was similar in layout to the Minion chip I linked to - i.e. alternating gnd/pwr for most of the chip and i/o concentrated at one edge - just with fewer balls.  It's not entirely bad, but I can understand why e.g. sidehack would rather not go near it.  Still, that's a lot more 'intelligent' than some of the intel stuff that is a semi-random mess with two different ball pitches in die shadow / skirt .. at least for those needing to plunk it down on a board.