No way !

[Gino]

True, its an absolute must buy. If you join a game late and need to dab previous numbers it keeps up with new numbers easing the workload. I also undab so i only have the pattern

I do the same thing except I go and dab the numbers that I DON'T need... So when one of my cards is completely full I know to call bingo.

I been using the same tactic since the auto dabber came out.
You smart
You can easily go AFK with this method and chill during bingo.
Take a look at the screen once in a while to see if you have a full card.
Much easier then constantly removing the numbers you don't need.
People don't realize you can call bingo with a full card, even if you need a certain pattern.
Like AKillerFawn said, if you have the auto dabber, just mark all the white numbers you don't need and let the auto dabber do the work.