The addition of AI options for marketing-specific emails and landing pages is interesting for sure as we all continue to try and find how this technology will fit into our days.
However, one place I would find this very useful to expand into is when writing individual one-off emails, or conversation email templates within HubSpot.
This would be really useful for sales and customer success teams who are trying to adjust content for a desired result and want to see some other possible suggestions. I can see this being desired for both a subject line and main body content standpoint and would expand the use of the technology across a lot more users.