I can't think of an equally concise but more accurate phrasing so long as a reference to California remains, but maybe brevity isn't such a high priority.
The California notices are one of the only examples of it being put in your face everywhere
There is a whole philosophical bent about what "good" intentions might be which is way off topic.
When the side effects for ibuprofen read similarly to those of far more dangerous prescription drugs, then they're really not helpful
There are of course other problems as well, including lack of context (do you need direct contact, exposure over time, etc), and lack of a requirement to list the particular chemicals. As a result, there's no actionable information and the signs are entirely devoid of meaning.
The light bulbs/tubes/LEDs also contain a number of P65 materials, as do all the electronics...
We know that if the chemicals are there, we have to have the sign. And we know that the chemicals are everywhere.
So what benefit does the sign bring?
None.
Not actually true.
https://leginfo.legislature.ca.gov/faces/codes_displaySectio....
Companies are choosing to CYA because if they're sued the burden of proof is on them.