Thats just the difference between a good engineer and a bad engineer. A good engineer designs things around how others are going to use them, and the design with tolerance. They would have known you use 50kg bags, and realized that’s what you’re going to do.

In my field, we know people are gonna put things together with a hammer if it’s too tight, so if it’s intentionally a tight fit, we make it so there’s no room to swing a hammer