I have recently changed over to raised beds:
https://www.growfruitandveg.co.uk/grapev ... 76879.html
The second bed is now complete and filled with 8 inches of mushroom compost, but not digged. The first on was digged to 12 inches, giving a soil mix of 25% soil (sand) and 75% compost). This mix is 12 inches deep, above soil.
I can hear mus stuff grow. Visitors started the same sowing time as me asked me what I do to get the stuff grow so fast. My first cucumber was harvested before their's even flowered. My Swiss Chard is growing very large. The squash and pumpkins grow like never before. I however experienced signs on the pepper leaves that there is a calcium shortage, but there is no blossom end rot so far. The soil mix keep very damp. there is no signs of wilting. Even above 40 degrees of C / 106 degrees of F. I know mushroom compost is not the richest of compost but it is very good still.
What difference can I expect if I do not dig the second bed? I know the soft part then will only be 8 inches deep. I am planning to dig but I am curious.