Volatility would really be the main concern specially if you are that the employee of a certain company which do make out such changes when it comes to payment or your salary and if you are that someone who isnt prepared
If you accept and choose Bitcoin as your salary receiving method, you will have to accept risk and must know it would be better if you prepare some cashes for future when you will not want to cash out your bitcoin with loss, lower price than when you get it from your salary payment. Without cash reserve, you will have to cash out your bitcoin or have to use it directly with on chain transactions to pay something.
Salaries should not be paid in bitcoins because the bitcoins will be quickly converted to cash for use by the workers almost immediately after they receive it. This is because bitcoin is not yet generally accepted and there are not so many shop owners and businesspeople that will accept bitcoins for payment. If there had been, then the bitcoins received in form of salary can easily be used directly for transactions without need for change, and it will not create any issue.
Why not?
To reduce risk for employers, salary payments can be paid in two halves, one with Bitcoin and another one with either cash or stable coin. Salary payment methods should be in options and employers can choose what they like. If they only choose one method like cash or bitcoin, they will have to prioritize safety of your salary value or to take advantage of Bitcoin growth as their investment.