What do you do when a system gives points at character creation for flaws/disadvantages when a player can permanently remove the effects of that flaw by buying something or spending other points to cancel it out (still making profit on character points). Do you allow the flaw anyway or make sure that somehow this exploit is not going to work?
Example in Shadowrun 4th edition: Albinism is considered to be a light allergy to sunlight and makes you vulnerable to flash or glare effect if you don't have cyber eyes. Gives you 10 points. Easy..if you always wear full suit that cover each part of your skin and if you get cybereyes. Free 10 points for any Streetsam with full body armor.
Another example: Night blindness. 5 build points to get an additional -2 when in darkness to see. Specifically noted "a character's (natural) eyes". So if I take cybernetic eyes, I just got free building points.
My examples are from Shadowrun but this is common in many game systems.
Do you simply ban the combo saying this is obviously not a flaw if you don't suffer any effects?