I think this is mostly a US thing. Why use yearly salary? You’re not paid once a year, are you? Most likely once a month. Referencing monthly salary makes much more sense.
“I’m making 50k”. Great, now I have to guess - dollars? Monthly? Yearly? If yearly then what’s the monthly paycheck? Net? Gross?
Often in the US we’re quoted yearly salaries by businesses for full-time positions. They will hire us for, say, $52k per year, and that will be given as $2,000 every 2 weeks. But then if we get a $500/yr raise, they don’t tell us what the new rate is on the paycheck: we have to log into the account and see the pay stub to know what our hourly rates and biweekly paychecks actually are.
Typically, it’s hourly quotes for part-time and often full-time salaried workers, and yearly quotes for full-time, especially salary exempt. Personally, I get a yearly quote, and have to look up my stub to see what the hourly or my two week gross are.
The 2080 assumes you’re salaried at the normal 40 hours per week rate. Salaried employees don’t get a variable amount each week if you work more or less hours than normal.