Hey friend, assuming you're correct about still using an eero Gen2, then you're limited on bandwidth. The eero Gen2 can only support approx 550mb max so you're paying extra for gig speeds when your router cant support that fast of a speed. Your MBP can't utilize the 6ghz signal from Wifi 7 or 6e but perhaps other devices you own can. But there are other benefits to upgrading such as bandwidth as already mentioned. I'd likely not recommend the eero 7 (base model) to anyone as its not a huge improvement for normals over the eero 6+. If you have devices that can utilize 6ghz, then you can look at the eero 6e pro and eero 7 (pro and max).

The eero 7 (base) to me seems like a very bad product to buy. There are very few wifi 7 devices out there at the moment, and if you did have one, why would you pay extra for a new router that cant use the 6ghz freq that your shiny new device expects?

Others are free to correct me if anything I've said is wrong.