I wouldn't like to receive my salary in bitcoin because receiving your salary in an unstable currency sounds kinda risky.
I wouldn't like it to have parts of my salary lost if I'm unlucky i'd rather just invest fiat manually into bitcoin.
The Bitcoin is not stable all the time so that would mean that your salary is sometimes also not going to be stable and I do not have that.
With a salary you need to make sure that you get the same amount every month.