Yep, even DOCSIS 3.1 modems don't do much for upstream, since generally it remains at 3.0. They have to do physical upgrades, such as amplifier swaps, to actual

Yep, even DOCSIS 3.1 modems don't do much for upstream, since generally it remains at 3.0. They have to do physical upgrades, such as amplifier swaps, to actually add more channels and make DOCSIS 3.1 OFDM upstream possible. That seems like years of work, and won't happen any time soon.