You're talking from a pretty biased pov of a bubble. Public wifi is definetly not ubiquous everywhere in every country, and even when it is you need to have th

You're talking from a pretty biased pov of a bubble. Public wifi is definetly not ubiquous everywhere in every country, and even when it is you need to have the right credentials or it has annoying dark patterns requiring you to click through various steps before you can get online (if it works reliably in the first place), and there's a niche of people for whom such friction or issues are unacceptable from a business standpoint and their company is more than happy to pay a second SIM to ensure their laptop is always connected the moment the lid is opened to save time and friction. I get it it's not for you, but it's definetly for other people who values it. For example on the train network in my country, there's free wifi but it's so overloaded that using LTE tethering is much faster and reliable, and having that built in the laptop is even better for work, and that's why many business people get this feature on laptops. Imagine you are late or miss your important online call/meeting/presentation because you were faffing about with flaky public wifi instead of having built-in LTE connectivity. YES, hot-spot from your phone is a thing, but that's an extra annoying friction: Do I have enough battery on my phone to use it for the next hours? Did my hotpsot turn off automatically before and I need to restart it?