I suspect they are not usable for everyday use, because all those people that are claiming that they would be willing to contribute to Sailfish, if only it were FOSS, have not bothered to do so in the case of Nemo. This naturally raises the question of whether they really would contribute, or whether it's simply a load of gumflap. In this context, terms like 'we' or 'the community' usually mean 'someone else'.