What should I look for in a laptop with Core Ultra 5 125H: build quality, ports, and expandability?

  The 125H is soldered—there's no 'motherboard selection' to speak of; the whole machine is the decision. Practical checkpoints: is RAM soldered or SO-DIMM, is there a second M.2 slot, USB4/Thunderbolt and display outputs. One overlooked thing: whether BIOS allows unlocking power or memory config—many thin laptops lock it down tight. These matter more than chassis materials.