So many people denigrade these things as “crutches” for bad programming languages or underdeveloped skills, but I don’t know how you can beat getting live feedback as you type.
As someone who turns off autocomplete and other features when forced to use an IDE, and otherwise works entirely with code in a plain text editor (sometimes Vim, sometimes Notepad --- and sometimes just good old pencil-and-paper), I can tell you that "live feedback" is a distraction. It interrupts the thinking process like a backseat driver.
In all seriousness, I think you might be smarter than me and many/most people. What languages are you referring to? The above described setup really helps me with JS. IntelliJ really helps me with Java (I spent about a year trying to write Java in Vim!).
As someone who turns off autocomplete and other features when forced to use an IDE, and otherwise works entirely with code in a plain text editor (sometimes Vim, sometimes Notepad --- and sometimes just good old pencil-and-paper), I can tell you that "live feedback" is a distraction. It interrupts the thinking process like a backseat driver.