Yes bitcoin is considered as savings, however in case of emergency you can not withdraw it immediately since you need to wait just to have a big return on your bitcoin.
That is right, if we will allot and will maximize our money and make a wise decision, we can have money that we can use in case of emergency, and I tried it last year, I am just thankful that I have enough savings when my partner in life admitted to hospital, good thing we are making wise decision all the time.
As far as I know, no exchange issue withdrawal requests in a fast way. You have to wait for several days to receive your money in your banks account. It's not something to be completed in minutes in case of urgent cash needing.