"Many signs are metaphorical, linking visual objects or gestures to concepts. So when cultural shifts change the very concept of a word..."

"... a sign may no longer make sense. One example... is the word 'privilege,' which is increasingly used in discussions about which groups have more social advantage, such as white privilege or male privilege. One older sign for 'privilege' could also mean 'benefit,' 'gain,' 'credit' or 'profit.' It looks like putting a dollar into a shirt pocket. A newer sign visually represents someone being raised up, or put ahead, and is reminiscent of the ASL sign for 'inequality.'... Although the differences can sometimes lead to tension, ASL linguists emphasize that there is no right or wrong choice for a sign — because language is shaped by those who use it. The longer and more widely a sign is used, the more standardized it becomes, and ASL is still a fairly young, dynamic language...."

From "How a Visual Language Evolves as Our World Does /Ubiquitous video technology and social media have given deaf people a new way to communicate. They’re using it to transform American Sign Language" (NYT).

Also in that article: The need to sign within a smaller area around the face so it fits in Zoom.