I wonder what percentage of repairs on a gas car are things associated with the parts specific to being gas powered/powertrain? Just guessing for a minute, maybe it's 40%? I really don't know. The common items with EVs are electrical, suspension, driver interface issues (buttons, windows, etc).
In theory, EVs should have less repairs, but it seems that these days, a larger percentage of problems with cars are related to electrical, or software things. I've had 4 different EVs over the past 5 years. I would say that they have been only slightly less expensive with repairs. My Nissan Leaf's only real problem was with an A/C leak. Nissan quoted me thousands to fix it. Wound up finding a local place that was able to patch it for $200. My Ioniq EV has had several electrical issues. My Clarity PHEV had to have a very expensive wiring harness replaced (Woodchuck). My Bolt also had to have an expensive wiring harness replaced (not animal related). The last three issues I mentioned rendered the cars undrivable. It seems to me that EVs seem to have more electrical issues than my prior gas vehicles. And to go back prior to that, we had a Prius that had to have the traction battery replaced. Big bucks. So while EVs will have less mechanical issues than gas cars, I'm not sure how much less expensive they really are to maintain repair-wise. Now this is just my small sample.
I'm fairly sure in Consumer Reports recent car ratings, they have found that EVs do not have fewer problems than gas cars overall.