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A small company with no IT staff except a copule of "computer guys" isn't gonna care what you write their app in.
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This may come as a shock, but there is a world that exists beyond the realm of companies that only have a couple of "computer guys.."

The days of programming being a cottage industry where a couple of "computer guys" were viewed as gods is long gone. It is a much bigger and sophisticated world.

To your scenario, the unsaid response from the big software vendors is "We don't care that they don't care.."