TVs and vacuum cleaners are now a lot cheaper AND more reliable then they used to be.
Cars have become more reliable and relatively cheaper then they used to be, but they are a lot more expensive so have a long way to go until that point is reached.
TVs are definitely more reliable, but vacuum cleaners? I had a Dyson a few years ago and it didn't take long before plastic parts started to snap off. Meanwhile my mother in law's Electrolux or whatever is indestructible with occasional maintenance.
Cars have become more reliable and relatively cheaper then they used to be, but they are a lot more expensive so have a long way to go until that point is reached.