That's why i set myself a rule of whenever somebody says I will be there in 5 minutes I translate it to give me 5 minutes to show up if i don't forget about it.
And I hold everyone to it. If you don't show up in the amount of time you specify I'm gone.
I'm Romanian too I just hate wasting my time. My friends learned that really quickly.
What if they get stuck on the train? There are other, non-lazy reasons for being late.
If I'd taken a 30 minute train ride to come and see you, been delayed by 10 minutes, then find you're gone when I arrive I don't think our friendship would last very long.
That was valid before cellphones, nowadays I expect people to call/message if they're late. I suppose that reading Fuxy's post literally implies that no such exception is allowed, but I assume it's not meant to be an inviolable rule.