About spawning

I don't know if this could be an idea or not. However, the spawning in minecraft is seriously frustrating and confusing. You can go around, explore, do whatever and have all kinds of mobs spawn around you. Yet, in order to make any kind of farm, you have to be a million miles up on the air in order for the farm to work. I don't understand this. I've been trying to make farms in areas where there is a high population of mobs, should be easy enough to make box for them to spawn in and go from there. Instead, you have to make the box, ladder up a million miles.. even then, I'm lucky if it works. Why can't the mobs just simply spawn? Why do I have to make ugly farm areas high in the sky (which I don't like be that high to begin with).. instead of on the ground where a farm could easily be. I don't normally like to complain, but this is frustrating. I'm on bedrock, I know bedrock is limited to begin with, but can't the mobs just spawn in a dark box without all the frustrations? Thank you