Yes, I'm used to frequent cycles of modify/upload/test and with normal Arduino this is seamless, but in MKRFOX it's a pain cause I need to be selecting the com port all the time between programming and monitoring. This happened the same when I used an Arduino Micro as a Keyboard simulator some time ago.
And yes let alone if it enters LowPower.Sleep mode as in this case it would need the double reset to become accesible again
Dealing with it so far, but a little uncomfortable
Thanks