Your assertion is plausible for the old-fashioned, 20th Century, way of developing and publishing software. The critical issue is that there is not enough time and talent to work out all the (significant) bugs before release, and the folks are needed for the next project after the release.
However, the modern approach is to get as many eyeballs as possible on the code, and to spread the workload of finding and exterminating the bugs over as large a population as possible. Dare I say "open source"? A revolutionary notion, indeed -- 'way beyond simple modding via data changes.

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