The abacus is a convenient tool because you can do calculations in an instant.
Is it all right to use “convenient” in this way?
nicetomeetyou Is it all right to use “convenient” in this way? No. , than about speed.
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nicetomeetyouIs it all right to use “convenient” in this way?
No. Convenience is more about portability, ease of use, availability, etc., than about speed. The abacus may well be a convenient tool (all I know is the rough equivalent the slide rule if we're talking about analog computers), but it's not convenient because it is fast.