So you want to develop young players who are not ready to play in the NBA now, only to ultimately have to match a restricted offer sheet just to "keep them under your control" when they are ready? This is why Danny took Olynyk and why he had Draymond Green in for two workouts. This is not a Utah Jazz rebuilding plan, I guarantee you.
When you're selecting outside of the top 10, you go for the safe pick -- the guy you think has the best chance of simply being an NBA player.
Selecting in the high lottery is a different story. That's where most of the very best players are drafted, and a well run franchise will not have many opportunities to select high. In that range, you swing for the fences.
You don't build an extremely talented roster by making all safe picks.
I would say it is the other way around. You are correct that there may not be many opportunities to draft high. That is why making that high pick pay off sooner rather than later is so important. Outside the high lottery is where you swing for the fence. If it does not work, than you will have another try next year.
Being a more NBA ready draftee is mutually exclusive from having upside in IMO.
You wrote: "You don't build an extremely talented roster by making all safe picks."
I would counter that and say you do win a NBA championship by developing a lot of 18 year olds, unless LeBron is sitting there.
Also, why cannot a "safe pick" also be extremely talented? Did Detroit not make a mistake by swinging for the fences and taking KCP over Trey Burke? Does this somehow mean that Trey Burke cannot ever be "extremely talented", because he was a safer more NBA ready player?
Danny has had a couple of high picks. Did he shoot for fence as you say and take young upside players like Brandon Roy or Jeff Green? No, he made sure the high picks paid off and both high pick assets generated sure things like Ray Allen and much needed cap space that led to acquiring players who were NBA ready.
Draft strategy however is not my point. I choose not go by draft boards and the hype and prefer to judge players on what they do, as opposed how many magazine covers they are on or how highly they are "rated" by mock drafts.