I try to email them a separate email for each topic or similar topics, though, and that can be a lot of emails each week.
The reason for this, they were saying in one of the more recent dev chats that one of the things they prefer about email is that they can just forward it to the people it pertains to easily. if you have pilot tools, character customization, and a new map idea as suggestions you want to forward, that probably all gets handled by different people. ...So I've been rolling under the assumption that they'd prefer to keep an email per suggestion as they come rather than a big list to divvy up among staff once a week.