Do doubt plan for the worst, but most employers, especially HR departments, have no interest in devoting time and resources to someone that is not available. Also for post military education, i.e. University, applications need to be processed well in advance. Without a date, is it far to say you may get out anywhere from May to December? There are service members who rely on the GI bill housing allowance to supplement their disability while they go to school. What happens if they are accepted in the fall, but because the Army can't adapt and prioritize, without pulling teeth, end up failing the soldier and the get out in say October, when all along they thought they'd be out by July. So now they are stuck.
However, once a soldier is on TRANSPOC, the 90 days limit is this unbreakable requirement that requires an exception.
When I arrived at the WTB I was told 12-18 months by some. Pretty much wild ass guesses that was based on people arriving for surgeries and recoveries and what not. I will be about 8 months when I go on terminal leave.
I understand your focus on patience, but at the same time this behavior defends the system's failures. If everyone accepts it for what it is, then there is no hope that it will get on track. I have been actively challenging the system failures and researching policy to present various solutions. Also my proactivity, has uncovered options that are never presented to most people. One of things I used to tell my team leaders (HUMINT collectors) is that commanders don't know what they don't know until they know it. If we opt not to collect a certain thread of intelligence because it is deemed irrelevant, then the commander will make decisions off of information that is known. We are doing a disservice to our Commander because they don't have the full picture (good, bad, and ugly). It is no different in this process. If everyone just shuts up and colors then senior decision makers are briefed with a skewed picture of satisfaction. However, the more people that raise issues that is ground in policy and regulation (i.e. failure to meet published timelines) and the real impact it has on a soldier, then you will see action.
One time brought up it is an anomaly, twice a nuisance, three times collusion, four times it's a grave problem.