I guess with RxTx or UART as some seem to call it, you only have one device per RxTx pair so you need more IO pins... true didn't think of that, but my only real uses are 1) make some modem like thing for my C64 and 2) talk to a LoRa radio from my Raspberry Zero in both those cases I'm actually ok with having only one pheriperal and there is nothing else I want except the connection, all other things use other protocols.
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I guess with RxTx or UART as some seem to call it, you only have one device per RxTx pair so you need more IO pins... true didn't think of that, but my only real uses are 1) make some modem like thing for my C64 and 2) talk to a LoRa radio from my Raspberry Zero in both those cases I'm actually ok with having only one pheriperal and there is nothing else I want except the connection, all other things use other protocols.