10 GbE is still iffy even with CAT6 cabling over copper which complicates deployments and user experience. As a result, prosumer type devices like recent AMD x570 motherboards and the upcoming Intel Z690 based ones are including 2.5 GbE ports that are rated to work over CAT5E and provides enough bandwidth for a few hundred GBps with a lot less power usage on the switch side (something like < 4w / port seems common) and makes it easier for low cost passively cooled switches to work alongside a switching SoC that doesn't need to be terribly sophisticated to hit the latency requirements needed to support 2.5 GbE.