Can hindsight really be used to determine if a given move was good or bad? I mean take a pedestrian view. I choose to go home a different route than I normally do, maybe to pick up some groceries or something. At a stop-sign I follow the traffic laws then some idiot comes barreling through and t-bones my car. Do you look back and say "man going that way was a stupid mistake, how could I be so dumb!" No, not really. At the moment the decision was fine. That is not negated by a negative outcome necessarily. Unfortunate, sure, maybe even devastating and life-changing, but truly a "bad" decision in the moment? I would argue no it was not.
Now, if I knew that intersection had issues, and I had other routes available, or if I behaved carelessly in unfamiliar surroundings now I can say I made a bone-headed move. But just choosing a different route was not a bad decision just because it had a negative outcome.
Take what amounted to forced compensation for signing a free agent when the Jazz signed Goodrich and had to give up 3 picks as compensation to the Lakers, one of which became Magic Johnson. At the time, this was decent for the Jazz who fully expected Goodrich and Maravich to forma a super-duo. It didn't pan out, with an injury to Goodrich who never came back at the same level, and obviously Magic did, so it is viewed as a "turrible" trade, but in the moment it was really not seen as that bad for the Jazz, not to mention the fact that the reason they had to give up the picks was because league rules required compensation for signing a free agent. Imagine if that were the rule now! So really this was very unfortunate, but I do not think you can say it was a bad trade in the moment.
NBA History
nbahoopsonline.com
That is how I try to view these trades and transactions. Were there known alternatives better than the ones at the moment. Like with Lyles or even trading up for Burke, when there were other more highly-ranked players still on the board. So in this light, just because Mitchell and Gobert panned out well, for example, does not make the trades any more prescient in the moment. They were good trades in that they got their targeted player, and there isn't a ton of risk moving around a few picks later in the first round. But a player taken late lottery or late 1st round turning into a 50-point scorer in the playoffs or multiple DPOY is very rare, and frankly a lot of luck goes into it.