there should be 5x attributes:
strength - lift weight, hp, resistances to poison, cold, disease.
agility - speed, hit chance, dodge, reflex
reason- all craft skill, medicine, knowledge checks, language, use devices (magic weapons), speed of xp gain.
perception - find hidden door,trap, treasure, enemy. Sneak. Lockpicks. If its modern, this is for rifle long range shooting.
will - resistance to fear, pain, mind spell, charm. Social interaction (I mean shop prices). Sanity points.
this affect secondary stats, that are needed for every character:
initiative = agility (you act quicker) , will (you are less afraid), perception (you can spot the threat before, they spot you)
hp = strength (bigger can endure more), will (you are more resistant to pain= on 0 hp you refuse to get unconscious, if there is wound threshold, you act despite having leg rip out)
but there are also skills and feats for boosting all that.
but strength would be even more OP
attributes suppose to be most generic description of character in case of checking success for some unforeseen by system event. Above cover all possibilities and are the most clear.
f.ex.
"Alchemist is dead. But you get poisoned, by Black Lotus. You will die in 2k6 hour."
"I want to make an antidotum from the ingredients on the table"
"how? you don't know shit about herbs"
"there is book on shelf, there should be receipt. Fuck off. Let me roll"
"roll Wisdom - with disadvantage." [2x dice choose worse]
Strength as other attributes should not add a big bonuses (+0,2 dmg, +0,5hp). Not one that cannot be surpassed by skills, feats, level gain etc. And the attributes value should not be changed drastically after character creation (its not like you can gain 10kg of mass in 2 weeks).