'of which few actually work' could also have been phrased as 'several are already working' - how many do you need? Even if the current offering isn't enough fo

'of which few actually work' could also have been phrased as 'several are already working' - how many do you need? Even if the current offering isn't enough for your needs, how can 'there's not enough of it yet' be an argument against building more of it?