The dealbreaker for me is the missing portable mode which has been tracked in its forth year now, but never been worked despite being a highly sought after item 
: Add a portable mode · Issue #122 · arduino/arduino-ide · GitHub
The dealbreaker for me is the missing portable mode which has been tracked in its forth year now, but never been worked despite being a highly sought after item : Add a portable mode · Issue #122 · arduino/arduino-ide · GitHub