Careful relying on Gmail when sending bulk email. I have seen a lot of cases where that does not end well — your recipients won’t always get those emails, and your account can be automatically suspended.
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That said, I think it’s a useful thing! I don’t know why mail merge isn’t a lot more readily available. I don’t know why my email clients don’t allow me to list a bunch of email addresses as if they were all in their own “To:” fields; that is, multiple recipients with BCC-like blindness to each other.
For your first point, this is why right now we've instituted a pretty low limit of 50. You can obviously do it multiple times, but Gmail sets a daily limit of 500 and so we don't want to make it too easy to hit that.
In regards to the second point, that's exactly what this is. You're right that it's strange it doesn't exist, and that's an opportunity for us :)
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That said, I think it’s a useful thing! I don’t know why mail merge isn’t a lot more readily available. I don’t know why my email clients don’t allow me to list a bunch of email addresses as if they were all in their own “To:” fields; that is, multiple recipients with BCC-like blindness to each other.