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The best comment is on the page itself, "DBAs don’t like the DB server doing things that they didn’t expect."

Imagine how much less predictable your database becomes when it's trying to be "smart". I wouldn't want to be oncall for that thing.

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Makes me wonder if you could use a SQL Injection exploit to maliciously trick out the index generation feature, and create a totally shit index and cause a DOS attack.

If you have already found SQL Injection

then why not do it yourself?

or a lot of other bad things?

Could probably tip weighting to create unnecessary indexes in some cases. Really depends on how automatic the index creation is, could reek with potential exploits.

I don't want DBAs optimizing my indexes. With elastic horizontal scaling, I'm not sure I want DBAs at all.

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