Not really a requirement, you won't see USB section on the GUI. The capibaraZero is designed to support almost every device that support Arduino Wiring framework, so if a device doesn't support a feature, it will be hidden in GUI
why do you say this? I find SX1276 a perfect replacement for CC1101( that have problems with shared SPI bus). Also SX1276 support LoRa and have a wider frequency range than CC1101.
I have a bunch of esp32-c3 and build system of capibaraZero make it easy to integrate it(like other device of esp32 family). The only problem with esp32-c3 is the absence of USB OTG feature.
It depends on usage, if you make an ARP poison attack on your home network, for example, it's not a big problem, if you make it on someone else network, can be a problem :). Also pay attention on SubGHZ frequency, country restrict free frequency range
I saw the board, interesting, a really compact board with almost all module already soldered on it. The project structure and build system makes it easy to integrate new board, I consider it a valid option to reduce space and avoid issues of soldering all components. Thank you for the advice!
BTW their factory firmware isn't complete, it's just for testing purpose.