If I'm on vacation and I missed something it's either (a) something I can live without; (b) something that can be procured within a day if needed, which doesn't imply I have to dedicate all of that time, but rather that I will be going to town later that day or tomorrow.
Again, we're talking travel and holidays, not an expedition.
The counter examples people gave so far:
- a cable: well, maybe you don't need that cable anyway for the reminder of your 2-4 week holidays? Maybe you can occasionally borrow one at the reception or caffe? Is it a proprietary charging cable for your headphones or bike computer? Well, that's the advanture part mentioned in that article.
- clothing: trust me, local people will have exactly what you need for local weather. Getting quality or designer brands may indeed be difficult in remote places, but we're talking about an intermediate solution.
- working remote, lost computer: I know everyone tells you that the world will end if you won't meet the next deadline but that's not true. You can get a day or two off, things happen and people will understand. Meanwhile look for alternative solution, maybe a internet caffe? Talk to the staff at your hotel or local cafe, maybe someone can borrow you something for a day or two? If it's really that important, someone will ship you replacement. Again, it's the advanture part.
- medicine: this I must admit is tough one. If your life really depends on it then you simply don't forget. Sure, your luggage might get stolen but that's beyond your control and you have to cancel the trip anyway most likely. Otherwise you have the medicine in couple places, you should have a receipt and unless you're in a warzone medicine is generally available. I've been in this exact situation couple of times (Germany, UK, Ukraine, Vietnam) and I always was able to procure whatever I needed.