Very late reply from me to the original post.
But the reason why I would leave FaF is, that the majority of the player base has a very different taste in maps than me. At almost any given the majority of maps being hosted consists of dual gap, astro etc. This means that it takes longer for a normal map lobby to fill, so longer lobby sim time. When having a full time job and a being married there isn't that much game time to start with.
Luckily, there are more players than there used to be, who like normal maps. So it still makes sense to open FaF.
This has been discussed extensively I assume, but still this is the number one downside of FaF for me.