I worked out before that in optimal setups (devices with the best balance between tdp and performance), the 16C amd cpus and say 7700s gpu can match or even beat the M3 MAX whilst being less than 20% more power-hungry. Comparing that to the 7840, which can match M3 at 20w capped power, the logical conclusion would be that amd could make a large APU that could match/beat the M3 MAX. Which would be sweet!
So this sounds class! As for performance gains, the Kaby-lake G platform with AMD gpu built in (basically a 7300H or 7700H with Vega 20 gpu and 4bg HBM) were more than 20% more efficient than any comparable individual parts.
It'll be pricey, but we're essentially talking about a 7945HX AND a 7700S gpu with 25% more cores at as little as 55w tdp. Imagine the convertibles man.... THE CONVERTIBLES!