I would guess that if new item creation were implemented in the way that you propose, then Bitwarden would no longer be able to automatically populate the Name and URI1 fields with information from the active browser tab URL. The browser extension has permission to read this information from your browser, but the pop-out window is a completely independent browser instance, and would not have permission to read information from the parent browser. There may be some way to circumvent this limitation, but it doesn’t seem that it would be any easier than the approach described in @dflinn’s comment from the other thread.