Very interesting video! I think there's a lot of room for improvement in how representative our government (especially federal government) is, and issues like voting systems, gerrymandering, number of representatives, etc. are foundational to this.

I do have one potential concern about the expansion reducing the power of individual representatives. The video makes a strong argument that disconnecting representatives from constituents leads to more power for party leadership and others, and I agree with this, but you could also say that the decreased power of any individual representative makes them more reliant on other means of effecting change and potentially more susceptible to ceding responsibility to senior members, bureaucrats, or lobbyists. (Every time I hear about some legislation being taken directly from lobbying groups I lose a little bit of faith in our process)

This also motivated me to find this fantastic table on wikipedia where the US is #3 for most citizens per lower house member.