I think for very quickly looking at the output of your load test it would be cool if oha used some colors with sane defaults for how long something takes (maybe green 0s - 0.3s, orange, 0.3-0.8, red, >=0.8?).

I suggest using colors in the TUI view and in the final output. Of course, make it into an option but I think it should be "auto" by default so that if the terminal is detected to be capable of colors, it should output using colors.