I’m a front-end dev and I was a very early adopter of Foundation when it came out many years ago. I’m building a web app in the healthcare market and was very excited about Foundation for Apps. From a front-end perspective, I think their email app template solves a big problem in responsive design. (certainly did in my case).
But as is the case with all Zurb frameworks, once you start to dig deeper, you realise there is more hype than substance. The code is verbose, not optimized, and requires alot of customization to build something production-worthy. And i’m only referring to the SASS files.
In the end, the deciding factors against Foundation for Apps was that it is still a young framework. Foundation (imho) wasn’t truly a great front-end framework until it hit v5, and I suspect FOA will require a few version bumps as well.
Secondly, as juliancwirko mentioned, a port will always be a step behind the official version. Zurb won’t take the needs of Meteor users into consideration in their design decisions.
Lastly, we had no data on the adoption rate of FOA (to be fair, it only came out a year ago), which makes the likelihood that an active and engaged community will continue to update a port is unlikely.