The first is that somebody else will eventually have to work with it, decipher what the heck I was trying to achieve, and generally get tripped up and slowed down by it.
The second is that eventually I may have to work with it again, and sit there scratching my head and wondering what I'd been smoking when I wrote instead of focussing on the changes I need to make.
The point is to code for maximum clarity to humans whilst still achieving the desired functional and non-functional outcomes on the machine. You will use varying terseness as part of doing this because terseness isn't the point: it's just one of many means to your end.
It's not "cleverness", but rather the ability to express the intent as succinctly and clearly as possible. Higher level languages allow you to do that, lower level languages don't. Obviously, Go is not a very high level language because it forces you to write explicit loops instead of using comprehensions or functional algorithms. Loop is a primitive concept. All other factors being equal (i.e. performance) you should always prefer comprehensions or algorithms over explicit loops.
for(i=0,total=0;i<resultlen;i++) {
int price = results[i].price;
total += results[i].selected && (price&1) ? price : 0;
}
In C++, would you write the same structure using a single line for-loop and ternary operators?