You obviously didn’t pay enough monies for that cable then.
Over 10m I think it matters, not sure why I think that. I’ve had cheap cables that don’t work and expensive cables that don’t work. I’ve had cheap cables that are great and expensive cables that are great.
Cables are the same; within audio a coathanger wire performs just as good as an expensive coil of speaker wire/expensive cables.
I’ve been using Poundland HDMI cables without issue for years.
Curry’s/PC World love attempting to con customers into ‘having’ to buy £90-100 HDMI cables to use with their new TVs. Hate the place!
Usually it’s just build quality, and doesn’t affect the actual picture/audio quality, unless you go for a really really cheap one.