Good way to look at this battery is using your RV as an analogy. If you remove the battery from your RV and just have the converter putting out 15 or 20 amps, for the most part it works. Lights, furnace, etc. But then all of a sudden you run the slides in while the furnace is running and have a whack of lights on then things start to fade. A battery in the system smooths that out and takes the brunt of the shorter term or greater load.
I think we have to remind ourselves that there are a group of people on this forum who have grown up with gas and diesel and in a time where real men can breath pollution and smoke a pack of smokes a day and still put in a full day of work in the coal mines. To them the only right way to do things is gas or diesel. There will never be another way. All electric cars are for sissies and when an electric car can go 500 miles at one shot and then be filled up in 5 minutes then they will buy one...but it better have a speaker that makes vroom vroom noise. Electric vehicles are toys etc. All tongue in cheek here. But yes, we run into these types all the time when they find out we drive an electric car. I have had people in the car for 20 minutes not knowing they are in an electric vehicle. The'll comment on how quiet it is and how they can't even feel it shift and how dead quiet it is at a stoplight etc. I finally let them know they are in an electric vehicle and they will STILL sometimes light right into it and say they could never have one because of this that or the other thing. The big one is having to look for a place to plug it in. I bring up the fact that really that never happens as all I do is plug it in in the garage overnight a couple times a week. There are some who probably are not suited to electric cars but for the most part it is just fear of the unknown or just being misinformed. A good number of people who have test driven one of our vehicles have either looked into or bought an EV though. A test drive opens up a lot of minds
Now truck people, thats another thing. But we'll revisit that in 5 years. :)