This is tangential, but I think I understand why you can’t pick a value for your vote. The idea behind giving high-karma users stronger votes was that a high-karma user having the same level of approval for a post is stronger evidence of the post’s quality. Something that Alicorn likes-but-not-enough-to-strong-upvote has a better shot at being good than something that new_user_420 likes-but-not-enough-to-strong upvote.
This is tangential, but I think I understand why you can’t pick a value for your vote. The idea behind giving high-karma users stronger votes was that a high-karma user having the same level of approval for a post is stronger evidence of the post’s quality. Something that Alicorn likes-but-not-enough-to-strong-upvote has a better shot at being good than something that new_user_420 likes-but-not-enough-to-strong upvote.
This is indeed one of the major considerations.