This is a good point, especially for users who do most of their work on mobile. Accidentally submitting an incomplete prompt interrupts the workflow and makes the chat experience frustrating.
I also agree about the “Ask More” suggestions. When the keyboard opens or closes, the layout can shift, making it easy to tap a suggestion unintentionally.
One possible solution would be to let users choose whether Enter submits a prompt or inserts a new line, while keeping the send button available as the primary submission control. For suggested questions, a little more spacing or a clearer separation from the input area could help prevent accidental taps.
The potential reduction in unnecessary AI requests is worth investigating too, although the actual cost and energy savings would depend on how frequently these accidental submissions occur.
Hopefully, the Opera team considers both improvements. Small mobile UX changes like these can make a noticeable difference to everyday usability.