[Qiasfah]

"but for some unknown reasons most brands keep making changes to the layout with every model"

The thinkpad keyboard layout has been consistent as of late. The T460(s) keyboard layout is the same as the T450(s) keyboard, which is the same as the T440(s) layout, which is almost the same as the T430(s) layout with minor differences in the function keys.

These thinkpads are not an example of a brand changing the layout every model.