We have an option to embed forms and CTAs outside of HubSpot with provided embed code that's in HTML.
I believe enabling the same possibility for Custom Modules would be powerful.
I have tons of ideas on how we could implement dynamic and smart content, recommendations, tips on our website. That could enable a whole new way for developers and marketers to display relevant content, in e-commerce especially.
For example, I'm thinking sections like: product often bought together, you recently viewed, users recently viewed/liked/bought, most popular items, X users are now browsing etc.
A lot of marketing automation software tools offer such solutions and I think HubSpot is more than capable of doing that!