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One of the challenges with this particular controller is that it's wireless.  Wireless devices need a) a clear enough RF channel to the receiver and b) a suitable power supply, namely batteries.  Both of these problems are common enough for most people to be familiar with them.  The alternative is providing a wire which offers both power and signalling.

When conducting a risk analysis of such a system, the wireless version is susceptible to both loss of power and loss of signal (eg interference).  The wired version will not suffer from these unless the cable is damaged.

In a small sub there's basically no benefit to having wireless (because the controller is only ever going to be used from one location) and it introduces further risks.  In a safety-conscious engineering design, it is hard to see why you would choose the wireless controller.