Time lining is the simple act of associating actions with time frames. So we decide to start the next actions in a project on a specific date and time. This helps us work in sync together.
By not referring to time lining is planning it gives us more psychological freedom to be agile rather than rigid and inflexible in unresponsive when shifting momentum or approach is valuable to realizing the good we seek together. Timeline and doesn't have the connotation that we are necessarily needing to follow it and if we don't we have failed and must repent and defend our agility.