Yeah, for traveling to underdeveloped parts of the world, hybrid is the way to go.

My dude, Kauai's road length is hilariously small. So you drive during the day, and charge overnight while you're sleeping. Putting that aside, which would be foolish to do since that's how daily EV ownership is experienced, you could park at a Level 2 EV charger and then go to the beach, go to lunch, go on a tour, live your vacation life. The fact of the matter is, unless you're driving for 5 hours or more out of your precious vacation day, you aren't going to run out of battery on Kauai.

Let’s also add that they probably want you bringing back a full charge like they do a full tank for an ICE vehicle

You've tipped your hand here by showing you don't know what the rental experience is, which makes me question if you've ever considered renting one. All of the commercial companies want you to bring it back around 70%. Nobody charges to full, nobody wants an EV charged to full unless you're planning to wring out every single mile it can do in a long stint of a road trip.

I drove from Santa Clara to San Francisco international after charging overnight in Santa Clara, reached the airport with more than enough state of charge. Took no extra time in my schedule, I went to dinner while the car charged, making it just as convenient as stopping at a gas station. Sure, it took more than 5 minutes, but I didn't care because I was doing something else productive during that time.

Waiting 30 mins for a supercharger...

Something I've never done ever. Not once. Then again, I also don't fill up ICE vehicles when I'm returning them because I actually have to stop at a gas station and pump gas rather than charging overnight. When I drive my own EV to the airport for a business trip, I arrive with more than enough to park for a week or two and drive home. No charging stops, none of the contrived nonsense you've attempted to make up to scare people.

I have no desire to add 30 mins or more depending on how many stops I need to make to charge along the way

That's not a long trip by any measure. Driving the entire capacity of a modern EV on the highway is about 3 hours of actual driving time at full highway speed. If you're renting a car for a 3 hour trip, then I'm just going to suggest you not bother owning a car in the first place and rent one when you need one.

I want to spend the least amount of time in the car as possible

Great. Same. Which is what I do. Apparently you seem to think you need to sit in your car while it charges, but simultaneously think that a charging stop gives you around 30 minutes of time to kill. Can you think of anything to do for 30 minutes after driving for 3-4 hours???

it’s wasteful to just get rid of a fully functioning car that I barely drive to begin with.

This is a separate point to everything else being discussed, and nobody's debating this fact with you.