Interesting that I was wrong - another data point in the "it's more complicated than you think it is" column. I always thought you were supposed to drop them (because I was explicitly told so by a French engineer I worked with in the 90s, talking about one particular poster, and many years later still assume that one hallway conversation was enough to make that THE OFFICIAL RULE without bothering to actually check...)
It’s been a pet peeve of mine for quite a while, and an urban legend for quite a lot more. It was tolerated when all we had was typewriters (and even then you were supposed to add them, but it was cumbersome).
