Yep, the spell is flexible and you can distribute it equally between 1-6 targets.Power Word Fortify - unless I’m missing something, it says it fortifies up to six creatures. Which means you can distribute it evenly, or you can just slap all 120 thp on the tank.
Well, it's objectivelly not a waste of space because that space was not used for anything before...In the spell descriptions, to list the classes is waste of space. It is unnecessary − and is always untrue because subclasses and other features can gain the spells anyway.
It depends on how much space is used in the final version of the PHB. I don't know that saving half of a line of text (when printed in two columns) is somehow better than requiring people to constantly flip back and forth between the spell list and individual entries.In the spell descriptions, to list the classes is waste of space. It is unnecessary − and is always untrue because subclasses and other features can gain the spells anyway.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.