Prime example here is refrigerators. If you get a leak in the refrigerant line, your refrigerator is pretty much toast. I found this out the hard way when I wanted to repair one. They don't even have taps that you could refill it with. I had assumed there would be something like with a car's air conditioner where you could add refrigerant and recharge it. Instead, it's a closed system and because of the way that they are designed, to recharge a refrigerator well over $3,000, because the technician has to tap into the line and reseal it after they top it off which requires specialized tools, so basically if anything happens with that system, you're better off buying a whole new refrigerator. Super wasteful design imo. I guess one could argue that by making it not sealed it could be more prone to leaks over time, but it's still wild that you don't have the option of filling it with maybe 10 bucks worth of refrigerant and instead have to scrap the whole machine.