Does anyone have experience of growing brassicas in raised beds?

One of the claimed advantages of raised beds is that one never needs to
tread on them - so the soil does not become compacted. This goes again
the traditional wisdom that brassicas need planting in very firm ground.
Ideally brassicas also need to be part of any crop rotation.

Any comments? Some suggest that the reason for firmly planting
brassicas is to prevent root damage due to windrock. Perhaps this can be
mitigated by planting with the lower leaves right on the soil and
careful staking..

Andrew