What does TLP stand for?
TLP is not an acronym, it’s just a three-letter name.
Features excluded from TLP intentionally
Backlight brightness: this would conflict with existing desktop functionality such as the GNOME power manager
Fan Control: third party tools exist, thinkfan for example
Custom/user specific scripts: not available for support reasons.
ThinkPad battery balancing i.e. selecting the active battery: the Lenovo firmware offers no way to do this, neither manual nor automatic
Undervolting for Intel Core i CPUs: there’s plenty of third party tools