A political example might be the fact that according to gallup, people have supported a popular vote for the US presidency for more than 75 years (this article is 20 years old, but the numbers still stand), albeit the partisan difference in opinion seems to be more recent and it's not clear if people knew what to replace it, or if they knew about all the other faults in the US political system.

Other more cultural examples might be things like romans drawing dicks on Hadrian's wall, eating fast food and their timeless graffiti, surrealism being 100 years old as opposed to 'Zoomer humor', etc.

So, what are your examples?

A lot of things we live with have significant technical debt because they were designed and implemented without modern knowledge and understanding.

Knowing what we know now, in the present moment, what would you be interested in fundamentally redesigning if you could?

This does NOT have to be technology related, by the way, though it certainly can (anyone want to talk about redesigning usernames and passwords -- please?). It can pretty much be anything: NASCAR races, art criticism, specific social norms, sunglasses, etc.

In your explanation, don't just share what you're interested in tearing down, but how you would rebuild it for the better. What improvements would your methods bring to the table?

Inspired by this comment, and thinking about how we today look back on (for example) segregation, or the treatment of homosexuals through the last 100 years.
In the year 2120 what do you think human society will look back on and be disgusted to think about?

The big one for me I think will be the treatment of animals, and not just battery farming, but straight up growing them for slaughter: food, clothes, lab-testing, etc. With the nascent industry of 3d-printed/lab-grown meats gaining traction, as well as vegan and vegetarianism on the rise through much of the West, it's not hard to imagine our great-grandchildren being horrified at the thought of their ancestors raising animals just to kill them.

Beyond changing work-at-home policies. Diversity? Work/life balance? Team dynamics? Hiring practices?

What caused the change? Was this an ongoing conversation and recent events just lit a fire under it, or is it a new corporate strategy?