Salary = compensation for doing the job
Equity = compensation for taking the risk of working at a company with a high chance of failure
Therefore, in the future, an employee with lots of equity should still be paid a normal salary/raise/bonus because the equity isn't "current" compensation for doing the job, but a reward for taking a risk long ago.
But ignoring equity entirely is silly. Much better to say that you should consider salary and equity separately. One is for doing the job and the other for doing it now when uncertainty and the possibility of failure are high.
Also, some people (like me) would trade an increase in equity for a smaller salary, so it's not a perfect separation. I had a job offer once that gave me two options to choose from, which was really cool.