Front end drag and drop email builder
One for the most frustrating elements to Hubspot is the email builder. To have to build a template for an email that requires a slightly different layout just quadruples the time to make the email.
Many other tools that we use in parallel with Hubspot allow for a front end drag and drop email builder. This gives you the freedom to adjust the word within a template but also add/remove module with ease.
Please implement asap as this has become the norm across lots of marketing tools.