Also, his handling of Broberg and Holloway, the top two young players on the Oilers, directly led to the Blues successful double offer sheets - the first in NHL history and also a factor for why the 97 era Oilers don't have a cup. These offer sheets were arguably the most embarrassing moment for the franchise and is something they will never live down - Jackson was also to blame for this.
This happened post Ken Holland, and was all Jackson. And you had to go back to 2020 to find another Holland blunder with the Gagner trade.
The Jack Campbell situation, and to be honest, the struggle with goaltending in general, lies much more in retaining Schwartz, in my opinion. Look at Talbot, Koskinen, Campbell, Skinner... and pretty much every single goalie that we had over the period he's been the goalie coach. Campbell could have been a solid netminder (as could all of these), and no way Holland could've predicted he'd flop (save, of course, for the fact that the one constant, Schwartz, has been retained for far too long).
But you seem to have also forgotten how Holland built the team that got to the SCF two year in a row, and who has been consistently in the playoffs (and at least second round, and losing to the cup champs) for the past 4 years.
The Ekholm trade, one of the best trade deadline deals we've seen in decades, or signing Hyman, for example, or solid, good value additions, such as Kulak. And even names that are no longer in Edmonton, but had a positive impact, at least for a portion of their time in the city, such as Kane, Perry, Kostin, McLeod...
Not to mention that inheriting the horrible Nurse contract in a period in which the cap was extremely constrained hurt a lot.