>>1512542Raised bed anon here. Raised beds are a specific type of tool for use in specific situations. Thee are many types, but they basically boil down to 3 types: borderless, bordered, then hugelkultur or flat. You can use hugelkultur or flat with or without a boarder. Each version is a bit different. With such a tall bed as one of your requirements, a hugelkultur raised bed would probably be better for you. Doubly so because it uses logs, limbs, and branches as its base. They can be very tall. If you want a flat top bed then such a tall bed can be very specific due to the fact most vegetables don't need such a massive amount of extra root space and will do fine with a much shorter bed. My raised beds are 16"/40cm tall and flat topped. I can sit down on the block walls and work comfortably. Since that is what I intended, they work well for me. Other people prefer shorter beds or borderless beds for the types of gardening methods they use.
>a bother to fill up?>75cmAt that height, it will take a long time to fill, but only if you don't have the materials to fill it right away. Raised beds are a once-and-done type of thing for the most part. They don't normally need to be tilled, especially if you rotate your crops and have tubers that need dug up in that cycle. In the end, they are less work over the long term, but more work in the beginning when building them. I suggest gathering up all required materials and building & filling them all in one go. Each season you will want to add a layer of compost about 2"/5cm thick over it. You can also use a thick layer of mulch instead of compost, which will decompose and help build the soil over the years.
>potting soilVegetables need a loam soil and not a potted plant soil. Loam is the "garden soil" you are referring to. If you choose to do hugelkultur I recommend that you don't dig a pit. That's just lots of hard work without much benefit.
https://www.permaculture.co.uk/articles/many-benefits-hugelkultur 