That wasn't self-inflicted, it was intentional. Charging at the airport is free, so I deliberately ran down the battery before going there. Charging from empty to full can offset the cost of one day of parking. Plus if I'm plugged in, I can run Sentry Mode the entire time I'm parked there. Since I couldn't get to the EVSEs (which I was almost absolutely sure I'd be able to use, since I checked the ChargePoint app before leaving home), the only way I'd be able to do it was with the portable EVSE I was carrying in the car. That is my point: sometimes, you have a situation where you want to plug in, and the only thing available is a NEMA outlet. This is what the mobile connector is for. If you carry it in your vehicle, you'll never find yourself in a situation where you want to plug in, the only thing available is a NEMA outlet, and you are unable to do so.
I generally aim to arrive with less than 20%, because charging in the long term garage is free.
[sarcasm]Sure, that's my favorite thing to do after I arrive at the airport with all of my luggage and I want to get home.[/sarcasm]
Be that as it may, you picked a pretty poor example of one in which you are advocating that "the mobile adapter needs to be carried at all times". Even if your example, given your desire to intentionally run the car down to try to get "free" charging, this was at an airport, and thus, you were "going on a trip".
That is, unless you just randomly decided while you were driving around to pull into an airport and fly somewhere.
So, your "airport" example isnt necessary a good one, because:
1. You ran it down on purpose so put yourself in that circumstance on purpose AND
2. You were going on a trip, and "going on a trip" is when most of us who say "its fine to not schlep the mobile connector around daily" say "this is the one instance when taking it from home might be useful, when going on a trip.
I have had my mobile connector in my trunk since I bought the car in Dec of 2018 (because I thought It needed to be there, and because I bought a tesla wall connector because I thought it was cool). The number of times that I have NEEDED to use it because there were no options = 0.
In fact, the number of options that I have used it at all is less than 3 times a year, and those times are always at a relatives house when we are going there for some holiday (thus "on a trip") so If I was using it for my home charging solution I would have just tossed it in the trunk then.
One has to have a specific use case for that specific person, to come up with a reason why the mobile connector "has" to be in the car for "daily" use. It might make people feel better, but they will almost always end up just carrying it around. At least, unless they are on a road trip, in which they can just add it to the things to take with them if needed, like a change of undergarmets and a toothbrush.