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The WiFi card in laptops tend to be modular so you may be able to upgrade it. I’ve never done it though so dunno
Used to be but it’s been part of the chipset for years now. You can add a USB dongle though
Mine’s a 2021 Dell Inspiron 15 7510, but its a 15.6 inch, might be different in smaller form factors
A lot of laptops still have socketed wireless. Intel even sells wifi 7 m.2 cards (using real pcie, not cnvio) for exactly this purpose
