Is it ok to drive a truck with a bad coil / spark plug?

I drive Ford vans at work. I could always tell right away when a coil was bad. Bad coils do not always set a latched code. It happened so often the mechanics stopped arguing with me. This was on a 2001. Many of the Triton's at work burn oil too. It does not seem to be a big deal. Be sure to check the dipstick occasionally. One quart or so per 3k miles.

My current 2013 Ford van has not had a bad coil plug yet at 24k miles. New record for me.