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Because the register sits next to the accounts rather than in them. It is updated at year end, the monthly charge is an estimate, and disposals are remembered late.
Depreciation spreads an asset's cost over its useful life, posted each period from the fixed asset register by the method set on that asset.
Each asset carries its cost, method, life and in-use date. The charge posts on schedule to the accounts and cost centre for its class, with no separate calculation to run.
A vehicle is sold in August. Depreciation stops at disposal, the gain or loss against written-down value is posted, and the asset leaves the register with its history intact.
It will not choose useful life or method for you. Those are accounting judgements; the register records what you chose and when it changed.
It posts to the ledger and the cost centre, reduces net book value on the balance sheet, and shows in the P&L as the charge for the period.
Straight line and reducing balance, per asset, with a residual value.
Yes, with the revaluation posted and depreciation recalculated forward.
Yes, pro-rated from the in-use date.
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.