I spent some time googling and found that the serial monitor of PlatformIO did have the option to "echo" what you're typing, but it seems to have been removed when the python backend upgraded to version 3.x.
My goal is to reproduce Arduino IDE's Serial Monitor's behaviour in PlatformIO's Serial Monitor: While typing, I would like to see what I type and the answers of Arduino go with it. I tried different "Filter" modes, the only one showing the necessary info is Debug (and it's illegible because it adds so much more info, I just want to see the echo as well, but no "tx" "rx" etc.). The Filter "colorize" seems like what I want, but unfortunately it behaves exacly as "default".
Would anyone have an advice?