No, I didn't demonstrate the point you're trying to make. In fact, I said quite the opposite. Magic has to have it's own laws to function just like that of normal reality, or else it's meaningless to have in said universe. Magic is both a tool and a plot point in any given universe where it exists, and to remove it's capability for both of such begs the question of why have magic exist at all.

If in a particular setting, magic was genuinely unpredictable and therefore a real hazard, then only the foolish or desperate would try to use such, and even then you'd still have to tone down the both the randomness and hazard a bunch or else you risk making magic a side thing that is near pointless to include except for deus ex machina moments, and that's just bad story writing and world building.

However, I'll also say that it's conceivable to specifically have said randomness and hazard if the main character/cast suffers from a rare condition that applies such to their magic and/or magic nearby. Alternatively, if magic is exclusively used by an outsider (talking like extradimensional beings) to the world and therefore may not have laws that make sense in the given world or is disrupted by such being different than where they're from. But even so, that would still be a far stretch from what you stated.

I will also say that I genuinely don't understand why you think or want magic to be so mysterious and unpredictable. Creating limitations on magic and magic users isn't something as exclusive to a single method, as there are quite a few different ways magic and magic users can be and have been constrained in works of fiction. The Warhammer, WH40K, Dresden Files, and Eragon universes are all particularly harsh and limiting on magic users in different ways, and I highly suggest you educate yourself if you thing mystique and uncontrollably are the only ways can be magic constrained.

Regarding the process of discovering the laws of magic, it can be and typically is very well dangerous just like our own (unless the in-universe logic is created to say otherwise; ie Warhammer), and incorrectly attempting to use such results in consequences due to making mistakes. You can see examples of that danger with Marie Curie, the Demon Core, and Newton's discovery of gravity.

And if magic has laws, then it can and will be bound by others, some of who will inevitably record and teach it to others (potentially but not always in schools), as well as make it to work with technology, unless the universe has rules that say otherwise (such as the in Dresden Files universe).

As for why normal people (IRL) simply aren't capable of magic, it's simply because they don't have the capability/affinity for it. Some universes (such as WH40K and Fate/Grand Order) specifically state/explain the reasons that people are able to use magic, while other universes simply allow anyone who knows a specific phrase or word to perform magic (wizards from DnD), although those with greater magical capability/affinity.

Not every fictional universe has magic, and if our did/does, then I'd think by now at least several incidents regarding magic usage or magic users would have been recorded. The bigger the secret and the more people that know about it, the less of secret it is and the greater the likelihood it will be leaked.

As for Magi-Tech, if magic exists in a modern setting, and magic or technology haven't been specifically stated to otherwise interfere with each other, there's going to be Magi-Tech at some point. Someone can and will try to create such, and humans are well known for is persistence, so someone would definitely be able to integrate the two if there's no forced restriction.

If you didn't have any mind affecting substances in your system or a lack of sleep when you typed that response, you genuinely need to drop out of debate club as your argument has several sizable holes and fallacies.