The irony is, there have been several og my jobs where all that was present were 'keyless' fixtures - and it has never been an issue.
I often instal a keyless during construction, as a source of light for the painters, etc. Heck, sometimes I have them up before the rock is hung! Apart from the convenience of having a light, it is an easy way for me to 'proof test; my wiring - especially when there are multiple switches.
