You're very confused. The Jazz have part of their foundation in place. They don't have a bench, but more importantly, they don't have a star; a number one option; a max guy. You need one of those to win a championship in the NBA, with the exception of that one Detroit team that everyone cites even though it was a clear, clear outlier. So the options were clear - to many people on this board, to our GM, and to our owner - we could either:
1. Commit to a full rebuild, which would involve gutting the franchise, keeping as many of the meaningful foundation pieces as possible (see: our young core), and working to draft a potential star.
2. Not commit to a full rebuild, overpay for a set of veteran free-agents that would take us to the first round of the playoffs and likely no further, and move through the next half-decade in mediocrity.
Our GM chose number one. That was the right choice for any small market franchise, as evidenced by the decisions made by nearly every owner and coach of a small market franchise who has made it to the NBA finals, many of whom probably played high school sports as well, though not necessarily Division II.
TLDR: You're off your rocker.