There's that. Also, there is the affect of Ancient Knowledge. It says it's supposed to buff Dwarven armor by 25% and speed the learning of Smithing by 15%, but by default it buffs all armors(light and heavy) by 25% except Dwarven and boost tempering by 15%(which can also increase the speed you level Smithing if you use tempering as part of the process). Ancient Knowledge used to affect all armors including Dwarven, but I think they tried to modify it in the last patch for the original version of the game(1.9) and only succeeded in removing Dwarven armor from the affected list.
Pretty sure that code carried over to the Special Edition and I doubt Bethesda has tried to change it(again). If you have the unofficial patch installed, Ancient Knowledge does what it says on the tin. One of the reasons I don't install the unofficial patch(or any mods). The original version of the quest reward is better(more broadly useful rather than just an early game thing). Dwarven armor is low mid tier and second only to Daedric in weight(tied with Blades armor though, but that can't be improved by default). Sure you can still hit the cap in it and mitigate the weight, but why limit yourself to Dwarven armor when you can hit the cap in anything(thanks in part to Ancient Knowledge. Custom Smithing gear and potions help a lot too, and Seeker of Might from black book Sallow regent. You might need little to no armor perks to hit the cap. Lower level flesh spells can temporarily cap off the crappiest of light armors)?