In Australia, with our "National Broadband Network" rollout, the highest speed plan a retail customer could get was 100mbit down and 40mbit up (100/40). In the last few years, this has now changes to 100/20 (and you need to buy a 250mbit down plan to get the old 40mbit up), because the national infrastructure co. charges for capacity each way, and uploads were just not being used enough for ISPs to justify paying for the upload capacity that was going unused.

I'm not convinced symmetrical is the future. I would like it, but even in these days of remote work, nobody cares about their upload speed.