The FCC has defined broadband as 25/3 Mbps since 2015. Prior to that it was 4/1 Mbps. The first FCC definition of broadband was established in 1996 as 200/200 Kbps. You can't really play loosey goosey with the definition. The service is either fast enough to be considered broadband or it isn't. The delivery method is irrelevant.
I wouldn't be mad if the FCC standard was still 10Mb.
But I prefer it increasing the way it has been. The downlink, at least. Minimum uplink should be at least a quarter of minimum downlink, if not higher.
And I disagree that 4K only needs 10Mb. I think youtube uses about that much, and it very much does not reach the full potential of 4K. Netflix uses about 16 with HEVC, with massive amounts of server time spent optimizing every second. And they recommend your connection be 25. And if you wanted to watch a live stream of the same quality you'd need far more bandwidth to make it work.