The whole point of the mage tower being designed the way it was with scaling was to provide a challenging experience to those who wanted to do it early and an easy experience for those who wanted to do it later. Almost all mage towers were extremely easily towards the end with new legendaries, antorus gear, etc. I did the healer challenge and ret challenge the 1st/2nd week and I loved them, they felt challenging in a good way. I did the prot challenge a few weeks later which was pretty damn difficult and then towards the end of the expac I did the challenges on alts and the difference was massive.
So if you couldn’t complete the towers when they first came out or didn’t want to try you could just go back at the end of the expac and complete them very easily.