The short answer is: more stuff that can break.
What you outlined is true in the best case scenario. Anecdotally, if I had to guess, 20% of my friends and family with cars older than 5 years have had them in the shop for something other than routine maintenance just this year. (And I realize that this is cherry-picked, but many (most?) ICE cars, frankly, are just not that reliable.)
Do EVs fare any better in practice? Just looking at reliability by manufacturer, Tesla's reliability is below the industry average^[1], which you would not expect if electric cars were fundamentally more reliable by virtue of having less "stuff that can break". The related notion that EVs are cheaper to maintain also seems up for debate^[2], and GGP's assertion that EVs have "zero repairs" is risible on its face.
I'm willing to entertain the possibility that Tesla is simply a subpar car manufacturer despite being the West's premier EV manufacturer, but either way we are evidently not yet living in a world where EVs offer car buyers freedom from maintenance and breakage.
---
^[1] random google search results: https://www.kbb.com/car-news/consumer-reports-toyota-lexus-m..., https://www.jdpower.com/business/press-releases/2023-us-vehi...
^[2] https://www.cnbc.com/2023/10/26/hertz-pulls-back-on-ev-plans...
Also, with Hertz having problems keeping Teslas repaired, its also not necessarily pointing to drivetrain reliability. Its not immediately obvious from the reporting if the issues they're having are mostly drivetrain or other parts like bodywork and suspension and what not. If a Tesla bumper replacement is more expensive than a Nissan Altima bumper replacement, is that EV drivetrains being more expensive?
BEV evangelists commonly steer reliability comparisons toward the drivetrain, since it in theory ought to be more reliable (at the very least it will have fewer moving parts), but I don't think my earlier comment was in an explicitly drivetrain-specific context. As you say, there are many other facets of vehicle reliability that matter.
It's also worth mentioning that modern ICEs seem to be exceptionally reliable even with the bare minimum maintenance, which makes sense given the maturity of the technologies involved. Transmissions maybe not so much, but the obvious answer to that IMO is hybrid drive systems—series hybrids, simple planetary gear systems, etc. Everything on the road today ought to be a hybrid, since they're arguably the most impactful way to distribute our limited battery production capacity. A standard hybrid battery is something like 1/100 the capacity of a BEV battery.
> “Remember, in the likes of GM and other OEMs, there’s decades of establishment of a broad national parts supply network. There’s an aftermarket of parts that that is there that is less mature obviously in the context of Tesla,” Scherr said, adding that margins and other EV issues would improve as Hertz looks to “diversify” that part of its fleet.
It sounds like they aren't saying anything about rates of issue, but rather cost. A Malibu could have 10 issues for every 1 of the same issue on a Tesla (e.g bumper replacement), but if the Tesla costs $2,000 to fix and the Malibu is $150 to fix, the Malibu is going to win. But one would expect that as the Teslas continue to become popular, cheaper parts will arrive.
Sure, I bought a first model year FCA car, so I understand. It's ICE only, and has been in the shop a lot (I should have pursued lemon law remedies, but it wasn't really that bad...). But it's never been powertrain issues. Bad crimping of connectors in wiring harness led to assistance features disabling, paint issues, multiple issues with infotainment, door beeper went out, problems with sliding doors, whatever recalls, 12v battery failed early, and the replacement failed a month after. All of that kind of stuff happens to EVs too.
Some day, I'm sure I'll add a spectacular transmission failure on this particular vehicle, and that wouldn't have been an issue with an EV, or at least not in the same way (EVs do often have some sort of gearing, and could be sensitive to manufacturing or assembly errors in the gears and bearings, but it's usually mechanically simpler than a 9 speed automatic)
Mechanically, my CR-V hybrid's "transmission" is two electric motors and two lockup clutches geared for different cruise speeds. Given the reliability of modern ICEs, it seems like the best of both worlds from a complexity standpoint (not that reliability necessarily correlates in a straightforward way).
