OK, so you are saving a whole 20 minutes on a multi-day trip with many hours of driving and multiple other stops during the day? That's just a minor convenience and hardly justifies a destination charger as being essential.
There is a very large continuum between minor convenience and essential that I think needs to be acknowledged.
Consider a multi-day trip where you've been on the road for 14 hours and finally arrive in the vicinity of your hotel at 9pm, with family in tow.
Option 1 is just check in to the hotel, plug in, and let the car charge overnight while you sleep, thankful to finally be out of the car. You awake the next morning to 100% charge, prolonging that first leg of the day when stops are the least needed.
Option 2 is to stop at the closest DC fast charger before your hotel. It's 9:45pm and everyone is getting ready to go to sleep, so not much need for snacks or drinks. So you just wait 20 minutes, or whatever the minimum is to get you to the first charger the next day, wishing you were able to relax in the hotel room. You awake the next day with 60-70% charge, or whatever 20 minutes got you, minus the transit from the charger to the hotel, so when everyone is well rested and not in any particular need of food or rest breaks, you still need to make a stop earlier than you would otherwise need to to get a charge.
Technically option 3 is to just get to the hotel with a low SOC and then charge ASAP in the morning, but of course that's going to take a lot longer because the battery is not preconditioned, and you will probably want to get more energy into the car in that first stop so you can have a reasonably long first leg.
Is the destination charger essential? No. But it's certainly more than a minor convenience. Everyone is different, but in my opinion, it's probably 75% along the continuum to being essential.
And then there is the use case where you are based out of a hotel for a week/long weekend. Again, it is more than a minor convenience to be able to keep your car charged for day trips that may or may not be in the vicinity of a Supercharger, and you want to avoid making a special trip to charge, taking time away from your vacation or whatever other purpose you have for your trip.
A couple of summers ago I stayed at a hotel in Olean, NY with charging. I was there for a wedding reception, and after the wedding, we went to check into the hotel, with only about an hour or so to get ready for the reception. The reception lasted late into the evening, followed by an after party downtown. It was probably after midnight before we arrived back at the hotel. We had a ten hour trip home the next day, so wanted to get on the road fairly early.
Now the nearest Supercharger (Salamanca, NY) is "only" 20 miles away (unfortunately in the wrong direction). So if not for the hotel charger, what are my options? Get to the hotel, drop off my family and then spend 40 minutes round trip plus 20 minutes charging (certainly not going to get a full charge in that amount of time), then go to the reception, etc. Start the next day with maybe 60% SOC and probably have to stop to charge within the first two hours. Or, I could wake up early and spend 90 minutes or so (with a cold battery) getting a decent charge while the rest of the family enjoys breakfast and socializing in the hotel, and then I've got my ten hour drive ahead of me. So even in the case of a "close" Supercharger, this pushes the needle almost all the way to essential.