I said this way back on page 4 or something and I'll say it again: Saying "Yes" to players leads to happier players and better narratives. If they want to stack up boxes to reach a window instead of buying a damn grappling hook, why should you stand in the way of that? Instead of a DC 15 climb check make it a DC 15 strength check. Same edge of your seat rolling if that's what you want.
Apples.
My least favorite game session I ever had the DM described a room full of barrels and boxes and an oncoming orc horde that was sure to doom us all. I started to barricade the door with barrels and boxes and the orcs rolled right of them and the rest of the party like wet tissue paper. We all died and for what, because the DM had an unwavering narrative in his head that the boxes couldn't be stacked fast enough. Not only did he not tell me that, he actively punished me for outside the box (the box being hack and slash) thinking by wasting my turn moving boxes. If instead he had run with the idea of the barricade, let us short rest like we needed, and then fight the orcs outside likely no one would have died and the session would have been much more fun.
Oranges.
In the first case, the boxes do not exist unless the DM plays a certain style of RPG, with multiple different styles being totally viable.
In the second case, the boxes did exist, but the DM was heavy handed.
Playing your style is great for you and some DMs, but subpar for some other DMs (myself included). Both have merit.