I can't just automatically return stuff.

I'm in Australia. Although we're covered by what I consider to be pretty good consumer guarantees, you can still only demand a refund in the case of a "major problem" with the product.

I don't think simply being unhappy with it connecting outside would qualify, although IMO it should.

https://www.consumer.vic.gov.au/products-and-services/refund...

What are the rules on returning stuff where you are?

Can you just buy a TV, use it for 6 months, and return it no questions asked?

If so, it sounds ripe for abuse, and surprisingly lenient especially if it's the US where I thought there were much less consumer guarantees.

It depends on the retailer, but probably you won’t be able to return it for a refund. You should attempt it though, or at least be able to present the retailer’s return policy as evidence in small–claims court.