@emoller, thx, it annoys me for a couple of years and now you ask me I, only two examples come up directly
but myriad more on JS driven sites.
Also for consideration, support for Sitelinks Search Box, search defined in JSON-LD or other microdata.
"query-input": "required name=search_term_string"
See that a lot nowadays in Wordpress driven sites, even a physical search-box is not necessary here.
I would prefer an option to remove unwanted default engines, it sucks to have space eaten by services from multinationals I don't like / want to do business with. On my tablet the first engine I can add, is always hidden, so I have to scroll to it.
Opera always complained about MS behaviour of bundling and pushing certain services or products. Opera does the same now, and it can only do it because it's too small to be able to misuse market-power. I don mind default settings, as long as it's a setting. Search engine should be a setting. And I wonder where to disable suggestions. I really think it´s a privacy concern. People are not aware all they type is transferred to Google right away, without any consent (before they press search)