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Laws are magic, you can't realisticly distort reality without magic or something. The only reason that branded warriors and such can exist is because low rank maguses require a physical body. Hit one's body hard enough and they will die. However, can physical strength destroy a spiritual existence? Nope. As such, warriors really are only useful at ranks 0-3.
Is Law and Dao different? Is it different because Dao is Way? Should Law be considered as magic? How does a Warrior have a Law?
I kinda disagree. Death, Wrath, space and time aren't magic. If magic can control I think so can non magic beings can control them.
"Wrath" is the embodiment of a mental state. Sorta hard to control that with non magical forces. And with space and time magic, one can teleport and go back and forth in time. While it is possible to do that with non magical forces, it isn't realistic to be able to control things like that with non magical abilities. However just because you can do them without magic doesn't mean that you can do them by being a warrior.
Why there needed realism to be involved? It's fantasy so there might be a bullshit way for pure warrior to control natural forces.
You haven't read many martial cultivation novels eh? No worries, neither have i. Martial cultivators focus on understanding the natural laws. Fly like a bird, sting like a bee, spin like a hurricane and other stuff like that is just a martial artist's way of borrowing examples in nature of applying said laws. Thus while they seem different, a magus and a warrior actually follow the same path, only by using a different approach. A magus seeks to understand laws through theory and reason. A warrior seeks to understand laws through experience and instinct. To exemplify it would be like this: a magus will start an experiment to observe how fire works and interacts with the environment; a warrior will walk through fire to feel what it means to burn. One is brains, the other is brawn. One is more likely to play it safe, the other is more likely to die stupidly. Those that succeed are a mix of both, but focusing on one or the other.
I think many of them would achieve abilities that, to an outsider, might seem quasi-magical. In Chinese martial arts, the concept of "qi" is the best example that I can think of. In western terms, "qi" = "chakra", so basically all the stuff that you see in naruto, hunter x hunter, and dragon ball Z is supposed to be completely un-magical. In eastern martial arts cannon, "qi" if anything is the primary brute force measurement of how strong a "warrior" is. No matter how good someone is at the motions of waving a stick physically, they're automatically labeled as "bad" if their "qi" usage is considered bad. Asian martial arts are all divided into "Internal" (内) and "External" (外). Internal refers to martial arts that include training in "qi", and external refers to martial arts that are 100% physical (no qi). The External martial arts are usually looked down on because they're regarded as the "shortcut" to gaining strength (because I mean, it only takes one or two decades to master something like karate), when in reality it doesn't give you the "real power" that makes a martial artist outstanding. This is because no matter how many bench presses you do, you cannot exceed the limit of your muscles. "Real power", on the other hand, is like stuff you can gain from "cultivation", which allows you to utilize "qi" to exceed physical limits thousands of times over. The "real power" refers to the quasi-superhuman abilities that "qi" is supposed to be able to give a person if it's used properly. The super-common example in wuxia movies is that "qi" can enable people to run across water and fly (lol). In some canons, the "qi shell" that some very powerful people are able to form is basically indestructable. You could throw a nuclear bomb at these types of powerful people and they wouldn't die because their qi protects them. This doesn't meant that their skin is actually that hard -- it's just that their "qi" can act like a shell that can resist unexpectedly powerful things. Invincibility is kind of a cheat in its own way.
Magus and warlocks are not warriors. They're mages. They have crap physical strength because they're mages, which means they spend most of their lives studying magics. Don't know what levels you are talking about, but a typical A rank adventurer in web novels can generally kill adult dragons with a party of other A rankers. Similarly, other adventurers from D&D can typically kill dragons together at about the same level of proficiency.
Nope. Can't even destroy a mountain, unless that mountain is a dragon and everyone in the party has 'dragonslayer' trait.
Well the pure warriors have to break their limits some how. Like this http://powerlisting.wikia.com/wiki/Absolute_Strength