I think the cardinal rules of magic was written by a Circle mage and thus the restrictions he explains are based on the knowledge that Circle mages have of what they can do. The reason for the Circles was to limit to extent of magical research so a rogue mage or mages couldn't do a repeat of the mistake of the ancient Tevinter Magisters. Anything mentioned in the novel was likely also stated by a Circle mage, so the same explanation applies.
It has now been shown both in game and in the novels that mages can levitate objects and cause them to move, including large objects like wagons with people in them (The Last Flight) and even whole mountains and buildings (Corypheus at the end of DAI). A Tevinter Magister and his apprentice (Alexius and Dorian) were able to research the theory and discover the means to undertake time travel (the limitation was in needing enough power to do so). The ancient elves discovered a way of constructing a whole pocket plane and the means of travelling between the material world, the Fade and this in between state. People can be brought back from death by spirits; they can also continue to exist in spirit form and then reincarnated in a new body. Somebody in ancient times devised a machine (the Magellan) that theoretically could alter the mind of every person in Thedas (only not done in practice because the heroes damaged it). Solas was able to alter the nature of reality by raising the Veil. A powerful artefact allowed us to open and close doorways in the Veil and walk physically in the Fade, with our companions, with no ill effects.
Really when you think about it, there is really no limit to what magic can do if the writers want it to.
I'd also point out that mages are meant to be very wary about coming close to raw lyrium as there is a danger to them of internal haemorrhaging, madness, deafness, memory loss and nausea. Yet in the Descent we were walking next to rivers of pure lyrium and yet none of the mages in our party suffered any ill effects. So it would seem that any lore we have previously been given about the limitations of mages and magic not longer really apply.