In my opinion the biggest benefit of the timeline approach is time, you do not need to rush the process, you meet the child/ client where they are at and there maybe many layers to peel before getting the connection that is desired. Biggest challenge is time as well, humans love things done fast and are impatient. To deal with this challenge, I would meet the caregivers and educators where they are at as well and get off the pedestal and work with them to support the child/client.