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That's also incorrect. Essentially, we have a 30 to 50% bonus from luck (there can be artifacts that are easy to obtain, and you can't really put anything else useful in their slot). Plus, there's Elven Luck (damage from successful attacks * 1.25).
So, the modifiers are:
Without Luck and artifacts: 1.375
With artifacts but without Luck: 1.625
With Luck: 2.25
The increase in average damage is 63.6% and 38.5%, respectively (because percentages should be calculated not from the base damage, but taking into account all bonuses, minus Luck).
An additional advantage of Luck, besides counterattacks, is the stabilization of probability. Luck without the skill doesn't have enough predictability, which is not taken into account in the value of the average damage, but it reduces its value.
It's also inappropriate to consider Elven Luck with its additional 25% bonus - this is a bonus from a completely different skill, not from a specific Luck skill - in the skill tree on the first page, it is clear that Elven Luck is present in all the Luck skills.
Added 1 minute ago
in general, we probably need to separate the tripled damage for Watchful Presence from Human Luck if we give Double Strike
... И древний лес, роскошен и печален,
Блистает там воздушностью прогалин.
Но между кедров, полных тишиной,
Расщелина по склону ниспадала.
О, никогда под бледною луной
Так пышен не был тот уют лесной...
Блистает там воздушностью прогалин.
Но между кедров, полных тишиной,
Расщелина по склону ниспадала.
О, никогда под бледною луной
Так пышен не был тот уют лесной...
