Why industry choose PI rather than PID or PD?

[THED]

Hi,

Why does the industry prefer to use PI rather than PID or PD? Is it because of the reasons below? Please let me know if my theory / finding is wrong.

- Easier to tune
- Easier to implement
- Save time
- D is difficult to find
- D slow down performance
- D creates slight oscillations.

[crossrulz]

What industry are you talking about?  I know of people who use all flavors for the PID control.  From what I've heard, it just really depends on the situation.