That may have been a brief trend on domestic flights with older airframes, but that isn't the general aviation trend. The last thing you want is more lithium batteries charging and discharging on a long flight over the ocean.
That ship, of fewer devices, has sailed.
However overland flights ( generally ) don't route up to 240 minutes flying time from the nearest diversion airfield.
Four hours is a long, long time with a cabin fire.