Yeah, it's not so much that they went this way for martials but that they blended this with a completely different inspiration for spellcasters. The wizard equivalents in all these fantasy worlds don't compare at all to 20th level D&D wizards. Much more limited in effects, a cost to magic use, can't sling out 2-3+ spells per challenge, etc. Early editions did put some more limitations on casters -- spell disruption, high SR monsters, best saves for martial types, etc. but even those have faded.
It's more that the types of fantasy that had the martial equivalent of a mortal Archmage didn't exist in popular media until AFTER D&D was created.
The space between knight and demigod of strength didn't exist.
D&D combined inspiration. But there was a gap of inspirations between levels 11-20 for nonmagical spell users.
That's why in early D&D everyone stopped getting HD and features after level 10 or so. After level 10, there where only BAD GUYS and "Characters turned Classes" like Aragorn. There were few inspirations for the books that would be high level.
But the fans wanted more stuff and less restrictions. So casters got access to bad guy stuff without the drawbacks. And martial go nothing because there were no high level martials in the inspirations books.
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