It is free, immediate, and shaped exactly like your business because you shaped it. For one person tracking twenty deals, it is better than most CRMs — faster to change and impossible to get wrong.
Anybody who tells you otherwise is selling something. The arithmetic in a pipeline spreadsheet is fine forever.
Not at the arithmetic — at the second editor. The moment two people edit it, there are two versions and the newer one is not always the right one.
And at the handover. Every won deal is retyped into a delivery plan and an invoice, and each retyping is a chance to be wrong about price, scope or date.
Frequently, for a while. The honest advice is to keep it until the handover starts costing you time.
The open pipeline and its accounts. Closed history can be archived rather than imported.
Yes, and it is much cheaper than doing it live.
Half an hour with your own data usually saves reading three of these. The guides will still be here afterwards.