Currently if you type "some text" in the quick search box, it generates this jql

summary ~ "some text" OR description ~ "some text" OR comment ~ "some text"

But then this hard to quickly change and refine the search, especially if you type it in wrong (3 strings to edit and all)

It would be better of it generated

text ~ "some text"

I spoke the Brenden Bain about this and he said the reason they did it originally what that summary,description and comment where the original quick text semantics.

But that 'text' also support custom fields and hence is semantically different.

But I argue that the benefit of "edit ability" is greater than the semantic preservation.