I fully understand being uncomfortable with a CPU swap, but a GPU swap isn't difficult.
Valve also could have gone the Framework route of releasing a motherboard+CPU combo so you can upgrade later down the line just by swapping the board out.
I guess they can earn more money by soldering everything on the board and having you buy a completely new PC every time you want to upgrade.
That would include trade off of locking yourself to single form factor. Less of issue with laptops with decades of design behind them. But unlikely to be preferable for first design you make.
Maybe someone can invent a universal system to allow CPU and GPU upgrades on a desktop computer.