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And I assume you also don't understand why anyone might prefer to use an IDE instead of vim/emacs...

Even when using an IDE I use a lot of keyboard shortcuts - they are part of the tools available to make my workflow quicker.

Less elements to worry about. I switched from Firefox to Chrome few years ago and now find separate bar being unintuitive. If I stayed on Firefox, I would say that having united bar is intrusive to privacy and illogical.

My final point, letting users decide would be the best option here, and Firefox did exactly this! I managed to reconfigure it into a single address-bar working as search bar too, except search engine auto-completion.

ctrl+l is also address bar.

Also F6 (at least on some operating systems).