Permanent beds for each veg?

Next daft question

I don't know about you, obviously, but I have never followed any of the soil rotation plans  - where a specific group of veg move to another area each year - the theory being that each veg benefits from whatever was grown there in the previous year. Don't expect me to explain it  as its beyond me!
I've realised that I always grow beans in the same place - always grow peas in their own place, every year - because that's where the supports are.
Perennial vegetables - leeks, kale etc stay put and seem to thrive. ...............
.........So, why, are we advised to grow annual leeks and brassicas in a different place every year?

You can probably see where I'm going with this........to create permanent "beds" for each veg that I grow. It would have the added benefit that self seeders would be in the right place to grow, year on year.

I like your thinking Veggie. I have grown onions leeks and garlic in the same beds for a number of years. The only thing that would change this is if my crops started to diminish or if I got something like onion white rot in any of them?
Same for brassicaas if I get clubroot.I had some plants a few years ago with clubroot in one of my beds, so don't plant brassicas there and don't know whether it's still there or not?
Peas and beans are fine in the same place with permanent supports but i would open trench at end of season and fill with vegetable waste, closing trench prior to planting.
I'm not saying full crop rotation has no benefit but is mainly aimed at a larger scale than most gardeners gardens or allotments? If I do have a poor crop in one of my beds one year., I will try and not follow with like for like the following year, but this rarely happens and I tend to forget what was there lasrt year anyway!

Just thinking about this. A permanent carrot bed would be stone free. A brassica bed would be netted.