Do I really need DOCSIS 3.1 modem?

I’m not sure where else best to post this, so please direct me if there is somewhere more appropriate.

I’m looking at getting cable again and still have a DOCSIS 3.0 modem. It looks like the biggest limiting factor is the speed but there are other mentions of “improved latecy and power comsumption.” If I’m not get a speed that exceeds 1Gbps, is the latency that much better for $160? I game a little online but hadnt noticed an issue in the past.

For that matter, is an AC wireless router is fine? The AX or Wifi 6 looked neat, but I’m just not sure the benfits are worth the cost. Any input is appreciated.