Clearly you've never found a torrent that has exactly what you want, but zero seeders.

Many countries outside of the US don't have unlimited[0] bandwidth ISPs. So downloading again and again is not feasible everywhere.

0. US ISPs are capped but in the TB range so most people never reach the cap.

UK internet is kinda pants, you can stream 4k on netflix no issues but try streaming from a pirate site or service like popcorntime and you will be kicked back to standard definition and have a lot of buffering to deal with.

In the UK sites like the pirate bay get censored, there are mirrors but they too get censored. Once you find a site you can easily get US content like the US version of the office but the UK version of the office will be harder to find.

You can buy 30TB of spinning disk for ~£600 which is a fair chunk of money but for comparison my 100mbit internet costs £300 a year. To get all your content instantly in one place in hd with no buffering I would say its worth it.

Then I guess you only watch extremely popular stuff? It's easy to get stuck trying to find moderately successful shows or games from the 90s. Kenan & Kel was a gigantic pain to find. I'm never going to delete that.

not always true for niche content.