The part about time turners being unusable on Azkaban premises doesn’t show up anywhere in the original canon, no. There’s nothing in the original books I can think of that suggests that any especially strong magic went into the creation of Azkaban. Its main strengths are that it’s guarded, and that the people who aren’t supposed to get out have their wands taken away.
While plenty of powerful things in canon are old, most of the old knowledge is still available. The Interdict of Merlin is also HPMoR original. Voldemort knew old dark magic because he looked it up, the basilisk was controlled by communicating with it via Parselmouth, and the heirlooms of the founders are presumably powerfully magical, having been made by some of the greatest wizards of the day, but the greater part of their value comes from the fact that they are heirlooms; if you made another sword with all the properties of the Sword of Gryffindor, it wouldn’t be the Sword of Gryffindor. The only founder’s heirloom that actually does anything really remarkable is the Sorting Hat, and while it’s probably a work of magic far beyond ordinary wizards, it doesn’t appear to be treated as an awe inspiring relic of the golden age of wizardry. If Dumbledore hasn’t created anything like it, it’s quite probably because he doesn’t have any incentive to. He already has the Sorting Hat, after all.
Rather than the founders of Hogwarts setting an unreachable standard, Dumbledore is described as the greatest headmaster Hogwarts has ever seen (albeit by a probably biased source,) and Voldemort and Grindelwald are referred to as the most dangerous dark wizards of all time.
The Deathly Hallows have powers which surpass ordinary magical objects in the original canon, but their powers are not that outstanding compared to other, non legendary magical objects, and while they were probably not actually made by Death, the people who did make them never divulged the methods of their creation.
All in all, the wizarding world of the original canon certainly didn’t demonstrate the sort of meteoritic rise in knowledge that the muggle world does, but the general trend seemed to be that while individual wizards might not be getting more competent, knowledge is being added to the community on net, rather than being lost.
The part about time turners being unusable on Azkaban premises doesn’t show up anywhere in the original canon, no. There’s nothing in the original books I can think of that suggests that any especially strong magic went into the creation of Azkaban. Its main strengths are that it’s guarded, and that the people who aren’t supposed to get out have their wands taken away.
While plenty of powerful things in canon are old, most of the old knowledge is still available. The Interdict of Merlin is also HPMoR original. Voldemort knew old dark magic because he looked it up, the basilisk was controlled by communicating with it via Parselmouth, and the heirlooms of the founders are presumably powerfully magical, having been made by some of the greatest wizards of the day, but the greater part of their value comes from the fact that they are heirlooms; if you made another sword with all the properties of the Sword of Gryffindor, it wouldn’t be the Sword of Gryffindor. The only founder’s heirloom that actually does anything really remarkable is the Sorting Hat, and while it’s probably a work of magic far beyond ordinary wizards, it doesn’t appear to be treated as an awe inspiring relic of the golden age of wizardry. If Dumbledore hasn’t created anything like it, it’s quite probably because he doesn’t have any incentive to. He already has the Sorting Hat, after all.
Rather than the founders of Hogwarts setting an unreachable standard, Dumbledore is described as the greatest headmaster Hogwarts has ever seen (albeit by a probably biased source,) and Voldemort and Grindelwald are referred to as the most dangerous dark wizards of all time.
The Deathly Hallows have powers which surpass ordinary magical objects in the original canon, but their powers are not that outstanding compared to other, non legendary magical objects, and while they were probably not actually made by Death, the people who did make them never divulged the methods of their creation.
All in all, the wizarding world of the original canon certainly didn’t demonstrate the sort of meteoritic rise in knowledge that the muggle world does, but the general trend seemed to be that while individual wizards might not be getting more competent, knowledge is being added to the community on net, rather than being lost.