There seems to be an automatic association between having a music stand on stage and having a stock-still singer peering constantly at the words, ignoring totally the presence of the audience. Whilst admitting that this could, in fact occur in some, rather odd, scenario, I'd suggest that it's a rather pushed exaggeration, and that the simple presence of a music stand is not the cause of such behaviour. Some folks (not just singers...) can, and do, use stands in an intelligent manner, and do not neglect the 'show' aspect of the occasion. Maybe I've just been lucky in witnessing this, but in that case I've been lucky on numerous occasions. Things aren't always as 'black or white' as that; there is scope for at least fifty shades of grey.