Both perspectives make sense, it’s simply a trade off. But it seem like the perfect opportunity for progressive enhancement.

An initial comment can be via email. Additional capabilities via a magic link received in response to the first email.

I love this idea, and I think it’s quite powerful in how frictionless it makes the initial process.

There’s a cognitive load to creating an account, even with a magic link interaction. Any requirement to “sign up” bring with all the baggage of experienced passed. This manages to break out of that space for me, which makes it a very interesting proposition.