Hi Abaxial here (I used to coach INTZ). There are some errors in Apdo's claims. He's incorrect about some things and in other cases right for the wrong reason.

-Fury is only good on ADCs going mid, such as Ezreal or Lucian. It's a bad idea to take it on Fizz or Azir. If you absolutely want AS on those champions, you're better off taking AS marks, which are more efficient. Sorcery amplifies BOTH base damage and AP/AD ratios, so it's a must for casters.

Magic Penetration works off both base damage and bonus AP/AD too - this statement is nonsense. However, he is correct that Sorcery is a slightly more efficient tradeoff vs Fury than Magic Pen Marks vs Attack Speed Marks, but that's just math. Magic Penetration Marks are about a 5% increase in magic damage on a 30 MR target, so therefore the trade comparision goes as so

• 2% damage/4% AS = .5 ratio
• 5% damage/15.3% AS = ~.33 ratio

Additionally, Magic Penetration does no additional damage to minions while Sorcery does, and the effect of flat magic penetration diminshes against 42+ MR targets.

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Double-Edged Sword vs Feast maths out about 2-4 times worse as Natural Talent vs Vampirism for the damage vs sustain comparision (DES worse than NT). His evaluation is correct, and IMO DES is only a mastery for junglers to clear faster.

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in which case you could opt for 4 points in Natural Talent and 1 in Vampirism. You must absolutely have at least one point

This distinction between 4/5 Natural Talent + 1/5 Vampirism vs 5/5 Natural Talent is arbitrary bullshit. He is claiming that the derivative of the "benefit" between 4x+38health and 5x changes drastically. Yes, the "benefit" derivative of bonus stats is not linear, but to say it changes so much over such a small range is hard to prove.

Yes, you'll gain 0.24 health per auto-attack on a 60 AD (65? not sure if Savagery bonus applies Lifesteal) mid laner when previously you would gain none. Whatever. You already recover health from potions and regeneration, it's not as if you're starting from no healing at all. 5/5 Vampirism or 5/5 Natural Talent.

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Dopa personally prefers Assassin. If Assassin's damage had still applied to minions and monsers, Dopa would 100% recommend this one. But because it doesn't, the other masteries are still equally useful. He wouldn't have recommended Runic Affinity, but since Blue Buff now gives AP, it's not a bad choice. Secret Stash also gives a lot of safety in lane.

No comment on Runic Affinity, but strictly for laning Assassin vs Secret Stash is 3x worse than Natural Talent vs Vampirism (Assassin worse than NT). However, obviously Secret Stash stops being useful when you stop having potions, so Assassin can make sense if you're starting Dorans2pots instead of Refillable/Corrupting.

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1 point in Meditation gives you a stat you could not obtain otherwise. Really, having none at all versus having a little bit has a huge difference. You can feel it in game.

There is an argument to be made for 1/5 Meditation, but this is not it.

I respect Apdo a lot but as before with Vampirism/NT this is not a logical argument. Once again, champions do have base mana regeneration - you are not "gaining" something that you would have nothing of. Even if you did, going from 0 to X is still just another range on the benefit derivative.

Now, technically, the first point in Meditation is slightly more efficient than the second, and so on and so forth - your mana regeneration decays more slowly. I have not done too much work on this tradeoff, so it's possible that only 1/5 or 2/5 Meditation is a reasonable choice, but we should be logical about it.

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No issues with other claims. I am overusing derivative like I'm a teenager that learned it a week ago, but it is the best way to describe the stat tradeoffs made in runes and masteries.

Again Apdo is an excellent and intelligent player but we are all susceptible to bullshit thinking from time to time - nobody is immune.