Chevy also put my battery in the trunk for weight distribution reasons, which makes the available space there even less. Maybe they felt they could do that because there was no spare.
I love my Camaro but it is definitely a "pay to play" vehicle.
Oftentimes, spare wheels are very tiny compared to the wheel they're replacing and just made to get you to the tire place.
The challenge with a donut on my car is trying to fit over/around the brake calipers associated hardware.
I've been lucky so far: in the 13 years I've own the car, I've had only one slow leak due to a nail. I haven't needed a spare yet.
Edit: none of these were hybrids or EVs, so it's not just batteries.
there is a trend to put instead of spare inflation kit + sealant. costs savings and such