Multiple reasons, ergonomics for one, and for more viable soil. For tomatoes and stuff you want a good 18” deep bed of soil.
Lot easier to go up than to dig down, more roots more fruits, and the tighter I can pack the raised bed, keeps weeds down and retains more moisture as well.
This end looks tall, the back right end used to be only an inch or so out of the ground, so barely 8” of good soil before the clay. Yes it looks overkill on this end.
That makes sense. Even if it's just ergonomics. It just looked like there was already plenty of dirt. I'm in the planning stages of a new garden because we moved after the cold set in. I'll be doing raised beds in part for convenience and because our soil composition is pretty rough.
Looks great! Is there any particular reason you chose those sizes? I'm going to be building some of my own soon but can't decide how wide to make them.
Arm length, 4’ is just barely reachable to get the center. You want to avoid putting weight anywhere on the soil while tending so you don’t compact the soil. That removes one benefit of using raised beds.
Layout a tape on the ground, see where you can reach and touch. If it’s raised off the ground you get a little bit extra reach so you can try and emulate that to find a comfortable size.
I would do like 36-42” if I made new ones, but I just went with some premade 4’x2’s since they worked with my other area.