Cause rogue is a martial that doesnt do “multiple modest hits” instead does spellcasting level damage every round, spell slots, no casting components of any kind, no disadvantage when in melee, can’t be counter spelled, can disengage as a bonus, reduced dmg taken on aoe dex saves… The only thing casters do better in combat is aoe dmg, which you never mentioned. In summary, rogues do caster dmg with martial defense.