You might not like the risk of not being able to open your car if the battery is flat but since I see these mostly on EVs, if your battery is dead you have bigger problems. Other than that's what's bad about them?
If your car crashes and catches on fire and you lose 12V power, your "bigger problems" include dying horribly in a lithium fire. Also, your "bigger problems" could include getting inside the car to pop the hood so you can change the dead battery. I'd rather not have to jimmy the lock or smash the window to do that.
They also suck in places with cold weather. Water gets behind them and they freeze, getting stuck. If you don't lock your car when brushing snow off off the roof, then you gotta try to pick compacted snow out from behind them. They are just a needless frivolity to save like .02% on aero efficiency.
Fortunately while my car has the idiotic things, they still mechanically operate the door latch when you pull on them, both inside and out, so I don't have to worry about getting trapped inside. There's also a mechanical lock hidden behind the handle, so if the battery is dead I can still unlock the car.