With 2020 Release wave 1 we have new features added to email templates selection, which makes it more intuitive and easier for the users to pick the correct template.
In 2019 Release wave 2 à
Clicking on the Insert Template button will open up a dialog box to specify language and search for the template.
In 2020 Release wave 1 à
Clicking on the Insert Template button will open the Email Templates Dialog box which will list down templates for selection based on the recipient selected.
And if we have 2 different types of recipients it asks us to select the recipient first to populate the template accordingly.
Search option lets us filter the templates further
We can also preview the messages before applying the template.
Also click on the Email button on the Activities window, opens the new email form as model dialog
Also check out
Opportunity Product enhancements in 2020 Release wave 1
Hope it helps..