Well first, no need to start off defensive, very few people here are going to give you a hard time about owning two paid off cars so that your wife can drive to her volunteer work in retirement. Also, if people here wanted to give you a hard time, they would, regardless of whatever caveat you put in your OP. In fact, 'round these parts, them's fightin' words.
Still, you're asking about such a reasonable thing that most replies are likely to be helpful and pleasant. Mention that you own 2 SUVs on the other hand??? Your entire thread is likely to derail into heated debate among members about fuel efficiency, etc, and your initial question will get drowned out among the stats about mileage and stats about mileage stats being inaccurate, or whatever, because shamelessly derailing threads is kind of our thing here. It's a lot of fun, but super annoying for the OP who phrased their initial post in a way that set off a derail-landmine.
Anyhoo, back to your actual question about owning two cars...wait, what's the actual question you're asking? I'm not really clear on that...
As for our personal experience, we only have one car, but it works out just fine because DH bikes everywhere year round and we live central in an extremely bikeable and walkable city. On the rare occasions that we need two cars, one of us will take an Uber. If we needed a car more often, we would use a car share service, which is so popular here that there's a station in our apartment complex, so the car is already here if we need it. There are stations every few blocks downtown, so it's very convenient. Whether or not this applies to you entirely depends on your city, infrastructure, and available services.
As for when the car needs servicing, most of that is planned, so we make sure that we don't need the car or take it to the garage that provides loaner cars. Or utilize the multiple options listed in my previous paragraph.
For most people I would recommend that they do an accounting of the cost of ownership vs the cost of occasional car service and see if the difference adds up to more or less than you are willing to pay/save for the convenience/inconvenience of ownership. However, you already made it very clear that it's not about money for you. So...what exactly is your motivation for considering getting rid of your car??