When I got my TM3 in June 2018 the app was so slow to connect with the car that I rarely used it. I also feared damaging it by closing it improperly. Like others here, I eventually put all my car stuff (charging equipment, tire inflator, wash/drying microfibre towels, snow brush, etc.) in there so it would be out of the way in the trunk.
Now that the app wakes the car up within a couple seconds or less and I've gotten far more used to closing the frunk; I use it much more frequently these days. Also, when I reach my destination, opening it from the in-car screen is quicker than digging out/turning on my phone and the response is instantaneous, so I only require the app when approaching the car when parked.
It's actually fun to use the frunk in public, as where I live Teslas are still almost as rare as unicorns and it's funny to observe others puzzling out why I'm putting my groceries in the engine compartment.