When some implant will have similar effect to any perk, it doesnt mean people will take implant instead of perk. You think, that if there will be avaible implant that increases hp for 40 then nobody will take lifegiver? It's nonsens. Sniper would take 3xmore crit, finesse and +3% crit hit implant also, couse why not? It would be avaible for everyone, so you cant take implant INSTEAD of perk, but you can take just implant, just perk, or implant and perk both. If there will be perk that gives +3 dmg threshold you would wear metal armor mk I instead of mk II? No, couse every PvP player could have such an implant.
However, implants increasing attributes, could really change build planning, so they rather shouldn't be avaible.