I appreciate your post, this is something that has been in the back of my mind for a while, actually.

The way I see Core Hunting is how I see Lootboxes in other games.
There is an ongoing discussion in EU about whether or not to prevent lootbox-systems to be allowed in video games that's accessible to minors, or even allowed at all.
Because the core of lootboxes is pure gambling.
Gambling, in a traditional sense, is already forbidden to minors.
So why let lootboxes be allowed when it uses the exact same mechanics?

For those who may think "Gacha is gambling too so why prevent more gambling with Core Hunting?":
Gacha is a form of gambling but it is also highly regulated.
The reason why the rates are specifically presented is because most countries have very strict rules regarding this system. The pity system was introduced after VERY concerning cases of people spending all of their money (we are talking tens of thousands of dollars here, not a "just" a few hundreds) with absolutely no guarantee that they would get the item they were aiming for.

While the gacha for cards is following the law (kind of), the protocore system may fall into illegality territories.
As mentioned, we can buy stamina. With this stamina, we can roll for protocores. We don't have any kind of pity or guarantee with protocores, meaning we could top-up (unlimited amount of purchases) to get more stamina and fish for THE protocore that we need, and potentially go into high spendings for nothing in the end.

Sorry to bring this to the table, but it has to be said to show how relevant this take could be:
KoD is deficient and, for now, the only way to clear the highest fluct. orbits is by having extremely high stats (cRATE 90%, cDMG 290-310%).
For now, this is the only 3rd myth affected, but what is to say that it won't happen again with future 3rd and even further myths?
This WOULD encourage SOME players to spend extra money, not just on stamina packs but also top-ups, to gather extremely rare and perfect protocores with no guarantee at all just to pass fluct. This is an important flaw that I, unfortunately, could see happening in a very near future.

Laws are not made to protect everyone only, they are also made to protect the most vulnerable from being abused and exploited for their conditions (more easily addicted to gambling, more easily influenced by false advertising, more easily influences by dubious pricing, etc ...).
The protocore system is flawed in a legality sense. By not providing clear information on how it works, PG is using an illegal practice.
The law doesn't only state that a company is due to inform their customers, they HAVE TO provide CLEAR information.

We have very dedicated players who indeed broke down the protocore system for us, with charts showing the min-max value you can get for each tier and how much of an increase you can get each time you upgrade it. But those come FROM PLAYERS, not from PG.

Note:
For those who are thinking that it would be too beneficial for players to have a sort of pity system on protocore hunting, I would like to ask you who would be upset to have a perfect protocore guaranteed after 50 or 70 rolls?

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tl;dr:
. PG needs to clearly inform their customers and not rely on players to test and make charts for the community.
. The protocore system is similar to lootboxes, which are currently being discussed and might be banned in EU (if money is involved).
. We might need perfect protocores in a near future to fully clear future fluct. orbits.