[sofixa]

It's not intrusive to ask for an email. It's a slight barrier against spam (trivially bypassed but still) and of course it's mandatory for resetting accounts, informing users about stuff (like Terms of Service changes). I honestly cannot remember the last time a website let me register without an email.

[mdp2021]

I can read one possible such «time» one click away (on your username).

It is not intrusive only if you can give a random address. It would be intrusive if all you had available was an address already used for other services. It is intrusive to ask you for, or coming to know, your name.