Hi, @daniel we have just tested SiPy without anything attached to it, with 5V input and deepsleep still pull 14.7mAh. That is unacceptable.
The IoT product we are developing on your platform is taking our calculations for battery lifetime from around +7 years down to a couple of days. It seems useless at the moment.
We tested the energy consumption with the following code
If you measure at the 5V pin while powering from the 3.3v you'll see the voltage minus the minus the internal diode drop of the high side FET (should read about 3v or slightly less).
I wouldn't recommend leaving other devices attached to 5V pin as they may be powered by that backfeed through the diode and potentially overheat it, but I don't see a problem to leave it floating.
There may be some very small extra consumption (a few μA? I'd need to order the TI eval kit to be sure) caused by this so, for optimal power consumption, you really should go plan for the L01 OEM module soldered on the PCB.