Wow, 2 or 3 more reports like this and you'll be eligble for a PhD from any number of online life-experience "colleges". :-)
I don't mean to mock. I found your report interesting and I thank you for offering it.
In my Prius's center console there's one molded cupholder that would leak any spill and one fold-out cupholder that would contain any spill. I think all should be the containment variety.
The Prius also has a water-bottle recess molded into each front door pocket. That's handy, but only for the bottle. It would be a bad place for a cup because of the awkward reach.
For the back seat occupants there's a sturdy fold-down arm that is a no-spill unadjustable holder for two cylindrical somethings. As my wife and I never have backseat occupants on long trips, I've installed a tall plastic tumbler as a substitute for the trash holder that for us would have been a better choice as standard equipment.
That scares me. I don't want to push down or tug up on a full cup of coffee. As the up-tugging is likely to rely on the rim of the lid, there'd be a good chance of its detaching with an attendant loss of control of the cup. All other things being equal, I'd bypass that vehicle. Of course, few other things are equal.
A 5-passenger Accord coupe I looked at had seven built-in cupholders. I figure for most trips that's coffee for the driver and a six-pack for the passenger. :-)