The cost of 2.5G chipsets is so low it really shouldn't matter especially for a 'premium' product like this.
There is one potential hurdle though: they specifically mention that it can handle 1G of traffic even if you enable a bunch of features. They would have had to upgrade the processors to be able to make the same claim at 2.5
If they are making it a point to address that in this current product I feel like they want to make sure that type of call out doesn’t happen again.
I guess they could always do a Tri-Band, WiFI 6E with 2 2.5xGbps Ethernet for $199. ( That would be awesome )
I also wouldn't call it nothing, 2.5g switches have much higher consumption and get hotter, let alone 10g.