ax is mostly about efficiency, not speed. While it has a much higher peak data throughput that’s often not realized anyway, so somewhat irrelevant.

ax really doesn’t do much for most home networks. In a small network, 802.11n will provide all the throughput necessary to stream most things at 4K. And few people even have a connection faster than ac allows.

ax provides faster speeds for highly congested networks, as well as better battery life for phones. That’s mostly what it’s about. It’s unlikely you’d see a difference between ac or ax on a small home network.