Quinn was the tank commander, but the idea is that Warsofsky can still potentially be a tank commander while acclimating to the NHL coaching job.
Let's say it takes 2 seasons for Warsofsky to learn how to be a proper NHL head coach. And for the sake of this let's ignore the question of whether he may not be one at all irrespective of development time. Let's just say that he's a tube of cookie dough where you don't have to do anything but put it in the oven for the directed amount of time (and for the sake of the metaphor, please don't turn this into a moratorium on how crappy storebought cookie dough tubes are. That's beside the point)
Let's also say that the Sharks won't be ready to actually threaten any team for 2 more seasons including this one (so they will suck this year, suck somewhat less next year and maybe be a playoff team by 26-27. Again I'm not actually concerned if this is 100% mapped to real world projections. It's probably a bit on the aggressive side, but it's for illustrative purposes)
So you hire Warsofsky now and in 2 years when the team is ready to do some damage he'll be ready to coach that team.
If you wait a year or two before hiring him you then eat into those potential competitive years while still training along the new coach. So now if you need both the competitive team and competent coach to actually be properly competitive, it's 3 to 4 years out before that happens instead of 2
If you hire him now, he learns on the job at a point where the wins are irrelevant in the face of the incremental development of the various parts and pieces. In 2 years time when the team is ready to make some noise Warsofsky has also evolved into a workable NHL head coach. Everything lines up and that window of competition opens in 2 years.
Now like I said those numbers are not terribly important in terms of what they actually are. It could be that it's supposed to take 3 years to be ready, or 4, or 6, or maybe something crazy happens and it's next year. It's just that if the team's intent is to go with a young head coach that grows into a potentially good bench boss then you're best to start the training clock now vs waiting a few years. The alternative is to not care about developing a new coach and instead just wait to hire a retread in a few years when we're ready to go.
Also the winning culture and "winning is everything!" is contrary to the developmental goals of the org at the moment. Trying to push for wins at the expense of proper growth is what causes stagnation just as much as being stuck in a morass of terribleness.
Would they like to win a few games? Sure. That'd be great. But these Sharks are hardly at the point in their development cycle where you look at them being winless through these first few games of the season and sound the alarm because it's not like they were ever shooting for the playoffs or anything. And I'm sure that while every player would love to win, I'm also sure that they signed up understanding that it might not happen, but that every loss notched this year was a building block for multiple potential wins down the line.