I happen to "live in the sweet spot" for PHEV. My commute to/from work is 5 miles each way, no highway speeds, think 25 mph the whole way back and forth. Every day, I drive to and from work twice because I go home for lunch, which makes it 20 miles a day. Some days I go back into town so add 10. So my usual daily usage is between 20-30 miles. Anyway, I mention this because most often my Clarity can drive all electric. On the weekends in errand mode, I'll do 70 miles on a saturday, but I can space my trips as to recharge between them. So a very high percentage of my driving is electric.
Some say, why no BEV then? Well, it costs some money to insure and maintain each vehicle. 100% of all the BEV drivers I've ever known (many) all have their ICE vehicle for long trips. So the Clarity to me is that sweet spot of 90% electric driving and for days when range isn't adequate I just burn (a small amount of) gas. And for long trips, I don't need a dedicated second vehicle.
But yes, the magic all ends if I encounter say a $9000 repair bill in year 11. I figure its a roll of the dice. I planned to have the car working well for at least 10 years to have my back of the napkin math work. And since I live in a ZEV state, I can pretty much guarantee 10 years of traction battery or without me paying for replacement anyway.
Where I win the game is if I can go beyond 10 years without a disabled vehicle. I don't mind degradation in terms of burning more gas at all. I mind getting an error message on the dash -- or the car disabled, that effectively means I can't drive anymore. So if it becomes a mild hybrid over time I win. If it becomes a pumpkin, well it was a good ride for the time I had it. That assumption that I'd go to mild hybrid mode in later years is the assumption I made that allowed me to buy the vehicle to begin with. If that proves wrong, well, I'll join the mild hybrid club and move on.
[And yes, all of the cars I've owned in my life have exceeded 200K miles. They were normal gas cars. Even my terrible Datsun B210 with the rust through the floor exceeded 300K miles. Anyway, I think for a modern car, it needs to go 150K+ miles to be respectable. My Clarity looks brand new, garaged all the time, and has 90K miles presently]