Re: Dear Matias,
@ 1st dave
In an ideal world it would be great if you could think of every permutation when moving from the lab and into production but unfortunately life isn't like that and you don't have unlimited time and an unlimited research budget, all you can do is cover as much as you can. If it were the case then not a single pharmaceutical product would ever reach market as every single drug has a side effect, my field by the way.
As for focus groups, a big criticism of them is that they are not representative of a large sample set and are subject to statistical bias. A room full of adults won't get Minecraft like a room full of kids.