FrozenNorth
Hero
You just said alignment was only a role-playing aid for the player. What does it matter to you as DM if a player feels that that Bond best reflects their character?One of my PCs has the bond "One day I will return to my guild and prove that I am the greatest artisan of them all."
That doesn't tell me much about how they'll go about achieving that goal. An evil PC may murder all the competition. A chaotic may outright cheat or bend the rules. A lawful character will play by the rules, although that may include some loophole or little used rule.
That's why I like alignment - it's an additional tidbit of information I can use. It doesn't even matter if anyone else agrees with me because it's a tool for my personal RP of that PC, NPC or monster.