Hi @JDP, welcome to the forum 
Penetrators are generally more versatile (there’s no fixed number of wires), and it’s much easier to get a low cost solution that works well for a range of cable types and diameters. Connectors also generally need to be bulkier to support high current throughput, which can mean they don’t fit in standard penetrator holes. Since most people don’t need to regularly remove and attach components we focused our initial vehicle designs around low cost penetrated options.
That’s not to say connectors aren’t a viable option, just that getting them installed and making sure they work well is generally harder and more expensive than an equivalent penetrator-based solution.
Here are a couple of relevant forum posts:
- Connectorized T200 Thrusters (Quick Thruster Disconnects)
- New waterproof connectors from Blue Trail Engineering
Feel free to post follow ups there or here as relevant