It is actually one of the few cases where I don't actually really care about independent upgradability. In my experience I find that I pretty much always upgrade my CPU and my RAM in tandem. New CPU architectures sometimes force it (e.g. need DDR5 instead of DDR4), and as long as you don't severely undersize your initial RAM choice I find that I run out of CPU headroom before I run out of RAM headroom.

So if there's performance gains to be had by co-locating RAM with the CPU in a single package, it makes sense to me to do so