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Because the correction is the easy part and the reason is the hard part. Quantities get edited to match the count, the ledger moves, and nobody writes down why.
A stock adjustment changes quantity or value outside the normal flow of buying and selling: a count difference, damage, shrinkage or a revaluation.
Every adjustment carries a reason code and an approver, and posts to the account that reason maps to. Damage, shrinkage and revaluation go to different places, so the P&L shows what happened.
A count finds nine where the system says twelve. Three are recorded as shrinkage against that location, approved above your threshold, and reported as shrinkage rather than buried in cost of sales.
It will not tell you where the stock went. It records that it is gone, when, and who signed it off; the pattern across counts is the thing worth reading.
It posts to the ledger and the cost centre, changes the warehouse quantity and the balance sheet valuation, and appears on the item's movement history.
Above the threshold you set, yes — and always for revaluations.
Yes, for revaluation or a change in landed cost.
Yes, count sheets per location, with variances posted as adjustments on approval.
Fourteen days, every module, no card. Or half an hour with someone who will run it on your own records and tell you where it does not help.