I'm sorry, that's just not a reasonable conclusion. They had
twelve years to perfect it, and you actually seriously believe they did
nothing to correct the problem in all that time?
And no, they never actually said in the pilot (
here's the transcript) that nobody had ever been beamed before. Just that "they claim it's safe" and that Reed and Mayweather were still wary. Obviously there would've been human tests before it was formally approved for human use. The fact that some people are nervous about a new technology doesn't mean the technology is unproven, just that human beings are wary of anything new. And why the hell would they even have installed the things on starships if they didn't expect anyone to use them?