We have two main reasons for disliking permanent exclusions and a host of minor ones.
Q: Whether it's a permanent exclusion or a managed move, what does ‘moving a pupil’ really mean, on the ground?
A: It’s a three stage process !!!

Permanent Exclusion can only ever accomplish process one, and so can never deliver this. There is a management discontinuity between process one and process three. Process one is accomplished by the school whereas the LA must both find a place for the pupil and fund it. It is therefore of very limited use strategically whilst doing harm socially. A permanent exclusion without arrangements in place for stges two and three really amounts to an unmanaged move!
Imagine if you asked a delivery firm to transport a parcel. How thrilled would you be if you were told that the parcel would be brought half-way by one van and then left by the side of the road for another van to collect? However many reassurances the company gave you that the arrangements were water-tight it's obvious prcels are going to go astray, especially if the delivery company is under pressure. Clearly, this is not a perfect analogy.
However, the same kinds of risks arise when a school permanently excludes and the local authority is not in a position to pcik up the pieces. The sixth day of exclusion passes, the hard-pressed case officer just cannot get to the new file, and the young person starts to drift away ... Well, we rejected them so why shoudl they care what we think they should do?
Where a school has worked with the local authority to make transition and integration arrangements that are secure this is no different from a managed move - a sort of mandatroy managed move instead of a voluntary one. In which case, was the permanent exclusion relly necessary. Far better to obtain the voluntary agreement of parents/ carers and achieve the move with a tenth of the paperwork, less chance of later challenges or claims, and avoding the need to reject the student and the child. Which leads to the second major reason
Q: How does being permanently excluded feel?
A: Expletive deleted!!!
It's a fair bet that at some time in your educational career, on more than one occasion, someone in their thriteis or forties has confessed to you: "I failed my 11-plus!" They still feel the pain. With exclusion, the pain is worse nd so is the impact on social expectations and feelings of alienation.
Here are some minor reasons
The direct cost of administering a permanent exclusion is in the region of £1,000. The lifetime social costs have been estimted as many times higher than this (see www.npc.org.uk reports)
With permanent exclusion, indirect and time costs are much more liable to mount up. These include: