You beat me to the question, Jerry ...
I have seen far too many "PROFESSIONALS" with lyric monitors that they are reading from - in fact we saw Frank Sinatra at the Providence Civic Center in the 80s using lyric monitors that even contained his 'ad-libs' ...
Saw Billy Joel at MSG last year and he had lyric monitors for his own songs!!! ... so I have no fear or sense of embarrassment for using a tablet for charts ...
Some may call it a 'crutch', I call it "using all the tools" to make my performance better ...
And I don't want to hear about 'eye contact' or having one's head in a book or tablet ... I have plenty of 'eye contact' with my audiences ...