Two haste weapons

[hong]

That is fine, but it is literally impossible for the core rules to cover every single aspect of the universe that might somehow be made 'too powerful' by some 3rd party material or some combination of effects no matter what their source.

Risk minimisation != risk elimination.

No matter what rules the core makes the core also says that specific spell/feat/whatever can override those rules by stating that they do. Therefore, nothing that the core says as rules can ever trump something put out later so long as that thing put out later says that it trumps the rules.

But you can make these people sweat a bit.