I would use $ too for the example you’ve posted - it is just assuming a different user.

As long as it is not root, I wouldn’t put it with #.

Agreed, the external connections like USB-C/USB4 will probably last a good long time.

I was thinking more of the internal stuff like the display connector (not sure what framework currently uses - eDP/LVDS/something else?), and all the input connectors for keyboard and trackpad.

Think this is more of a pipe-dream though, considering that 10 years is a long time for PC interfaces and internal interconnects. Swapping between different laptop manufacturers will be unlikely to happen, I feel.

Framework allowing for the whole mainboard to be replaced seems like a good halfway meeting point, and each case size being a constant chassis that hopefully will be supported for a long while.

Hope that other manufacturers follow suit, and at least have their own lines of upgradable laptops.