I do actually take my laptop about with me, so yes, it's very important that it's mobile, you could have asked 1st though, cuz the truth is, i'm going to be getting rid of my desktop PC soon, and replacing it with a laptop, I just like them better, i've had pretty much no issues with my laptops where I constantly have issues with desktops.
And the worst thing about having a desktop, is cleaning it, I hate that, laptops are insanely easy to keep clean.
laptops take up less space, I don't want to have to pack/unpack PC everytime I move house/change things, which is quite a lot.
There are many advantages of laptops you may not even realize...
Anyway, neither is a waste of money, all comes down to personal taste, same with consoles, it's really just a waste of your breath complaining about what other people like, unless it's dangerous or illegal.
"For 600-700€ you can build a PC that will run every game on highest settings for next 1-2 years."
I don't believe that, please convince me otherwise with evidence, i'm patient.