The real problem here is that the OP is generalizing too much.

Yes, parsers CAN be used to discriminate and exclude players. But in the end it's nothing but a tool. I can misuse a hammer if I so choose, but does that mean there should be a restriction on hammers? I could abuse the Lootmaster system if I wanted, but should we have that removed or excluded? The bigger point is why should we restrict or avoid a useful tool for the community as a whole just because of the POSSIBILITY of misuse by a few?

Let me put another perspective on this, similar in concern, but different: Astrologians. Their heal potencies were INTENTIONALLY low-balled initially because the devs didn't want people to just enforce double AST comps (and even now, still don't). Is that kind of cynicism justification to limit a new job? If you say no, then consider if the OP's cynicism is really justifiable for not wanting parsers in game AT ALL.

There ARE people who won't misuse it and WANT to get better, rather than simply accepting the (rather condescending by the way the OP uses it) "casual" label and never seeking improvement.