I agree that blocking would be needed. However if you are a business or individual that has email posted on the website it is not much harder for spammers to get it anyway.

Another usecase. Let's say I buy a domain myname.com for personal use. I might want people to contact me directly via @myname.com without having to create an unnatural sounding address like [email protected]. I have seen people buying @surname domains and then creating emails name@surname, which is pretty weird too.