Comment by harikb

The only projects I can accurately forecast is the one I have already implemented elsewhere. Meaning 90% of it is a rehash of something done elsewhere. Companies do this because... well.. reasons. Anything else novel/unique/innovative by definition can’t be predicted well because if you knew everything from the start, there isn’t any innovation being made. Many of the good companies that exist today pivoted from a broken prior idea or discovered a market while experimenting. This applies to every part of software development.