It would be nice if we could make the "Email" tab the default in Marketo Sales Insight (in Salesforce). This is the most referred to tab among our Salesforce users, and let's face it, Marketo Sales Insight can be slow to navigate around.
I would not agree on this. When well used, Interesting moments should be the most used tab in MSI. For a sales person, knowing that someone filled out a form, attended an event or registered for an offer if far more valuable than knowing which emails were sent or clicked.
If you do not have these info in MSI, and if email tab is the most used one, it is probably the symptom that you should consider investing more in Interesting moments.
So rather than changing the default tab for everyone it might be best if there were an option for each org / profile / user to be able to setup their own default.