My apologies for posting an imcomplete thought and never following it up.
Foundations are still very very important in UFS. More so than Assets, more so than Actions, on par with attacks.
Now consider, cards like this
Best Friends (permanent with a foundation commital cost)
Christie Mont (also permanent with foundaiton commital cost)
Mitsurugi (permanent with a foundatio destruction cost)
James Hata (permanent with a foundation comital cost)
Stand-Off (permanent with a foundation comital cost)
In none of these cards do i ever want to have fewer foundations. Granted, I need attacks to kill, but if I can find fewer attacks and kill just as well, I will do so. The above cards only encourage me to find ways to do so.
Granted, there are some techniques in the game that suggest I do otherwise. For instance,
Path of the Master (which we circumvent the use of multiple copies of different attacks and instead focus on attacks that are Multiple).
However the rewards that they offer are either ignored (the card is unplayed, Asphixiante)
or whose non-foundation-playing encouragement is tackled in another way (such as the above with Path of the Master).
Combo is a technique that rewards the play of attacks, however even it is either 1.) circumventable (new Xianghua) or 2.) being undermined (Lu Chen and face downing things in card pool).
Nightmare was supposed to encourage the play and/or possesion of fewer foundations or punish the possession of multiple foundations, but has been ignored, mostly unplayed.
And so on.
Until more attacks some how get around these issues, foundations will always be at least tied with value to attacks, if not greater than. And at the very least, always out-number attacks in their appearance in decks.