No, but I just did try doing a soft link from python3 to python. But not in /usr/bin where python3 is located. I tried that and it did not work. What DID work was to do that softlink in /Library/Developer/CommandLineTools/usr/bin (where python3 also exists).
I have no idea why this works (to do the softlink there instead of in /usr/bin) 
I still have to start Arduino IDE using the Open command in Terminal.