Similar to what Nicolai has commented, I'm not sure if most of the expected results (focusing the type selector after clicking an add button) will be convenient for mouse users. We should reflect this very carefully - for users who are not interested in setting type fields, or who just want to quickly capture some data, focusing the type selector instead of the actual input can create undesirable click feasts. Even for keyboard users, the same might apply. Going back from the input to the type selector (if needed) with Shift+Tab isn't all that hard... If we think this is required for keyboard users, I think we should seriously consider having a different and more convenient focus for mouse users.
Bug 1776657 Comment 2 Edit History
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Similar to what Nicolai has commented, I'm not sure if most of the expected results (focusing the type selector after clicking an add button) will be convenient for mouse users. We should reflect this very carefully - for users who are not interested in setting type fields, or who just want to quickly capture some data, first focusing the type selector instead of the actual input can create undesirable click feasts. Even for keyboard users, the same might apply. Going back from the input to the type selector (if needed) with Shift+Tab isn't all that hard... If we think this is required for keyboard users, I think we should seriously consider having a different and more convenient focus for mouse users.