Hot Water valve in home

I have an Amanda washing machine that is from 2003, but the hot water valve/tap and hose are from a house built in the late 70’s. I am replacing the hoses and washers/gaskets. I noticed the washer connected to the hot water valve out of the wall has a plastic screen/strainer shaped like a thimble. Can anyone tell me the purpose of the thimble-like shape? Also, does this design have any effect on the water pressure going into the machine?

Thank you.

That is a rudimentary filter and as long as it is clean and clear it should not affect but enhance performance.

Could you please explain what is meant by enhance performance?

Also, is there a downside with replacing the thimble shaped strainer with a dome shaped metal screen for homes built in the 1970s.

Thank you.