I don’t feel like this is the same as finding a magic sword, being made ruler of a keep, or gaining followers. All of which any character should be able to do with time, patience, role playing or luck
The idea is that the Christmas Tree Fighter or Fighter Lord gets a bonus to that subsystem.
Can I ask how they are not high level? Is that an assumption you have made or are you assuming their ‘level‘ is the lowest point you can have them do their thing. I’m not sure how you would make that assessment when attacks, AC, hps and healing are abstract concepts? Achilles might have 4 attacks and 200 hp or he might have 1 attack and 30 hp. They can both be representations of Achilles. My preference is for the 200 hp one
Because I don't consider Arthur, Robin, Archilles, and Wick anywhere close in combat.
Given the same equipment, there is a clear hierarchy in power.
Just take the Illiad alone. Achilles, Menelaus and Odysseus are on different combat levels despite being all high level fighters.
When you say these factor into their high levelness, how is this different to any other character class? High level characters do often possess magic items and followers currently without these things being baked in.
Again it's a problem with interpretation. An assassin's Creed assassin, Naruto Kage, and a Batman villian are all high level rogues but judged on different merits.
You can't just snag people from different worlds who come with different interpretation of what epic is then smack them together with no changes.
Either you choice one aspect to judge all members of a class by OR you deem multiple aspects as the same and create different paths to display their epicness.