Why doesn’t glue work

I’d like to know why it is that for things which companies can obviously make work if they want to, they sell things which don’t work. My biggest problems are with:
1. Glue:
I don’t know how many times I’ve bought glue which claims to stick things better than the original, only to have it fall apart on first use. Yet I know that it’s possible to make extremely strong glue because the furniture I bought from Ikea is made up of lots of short lengths of wood which have been glued together. But you can take a 2 metre 4cmX4cm beam made up of 30 cm sections and put it between 2 pillars and stand on it and it won’t break.
2. Car engines:
I know that truck, taxi and bus engines are built to run for 1 million km. So why can’t I buy a car that will do this? Why do companies advertise major advances in reliability (do they?) when they already know they can make a car run for 1 million km.

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