There is also fenix performance bundle version (010-01040-11) with two wrist bands, HRM, torx, screws etc just like in quatix but in addition - HRM. It is a little bit more expensive than quatix. You can also look at it.
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The quatix is more expensive than the Fenix, so why the Quatix doesn`t have the features of the Fenix + sailing features....
Because Garmin thinks that if you make many units with scarced functionality you would get bigger profit. But on the opposite it has a reverse effect. Good news is that you can find ways here how to replace the preloaded firmware in the device. If I am not mistaken there is already a topic with instruction how to upload the quatix firmware in fenix.

Honestly I don't know what so important sailing futures quatix have which someone would prefer compared to fenix.