the Logitech F710 is a solid controller to get if you’re on a tight budget, but perhaps not exactly the type of equipment you want to stake your life on. [...] Reviewers on sites like Amazon frequently mention issues with the wireless device's connection.
The reporter, who followed an expedition of the Titan from the launch ship, wrote that “it seems like this submersible has elements of MacGyver jerry-riggedness.”
It seems like a really bad idea to use a wireless controller instead of a wired one. But I guess it shouldn't matter as long as they have a backup wired controller in case the wireless one dies.
When working at industrial factories if I catch a glimpse of something run off a cheap consumer alternative to the standard industry equipment I immediately question everything. If they're willing to skimp on that item, where else have they skimped?