Let me expand
There are many conflicting ideas within the bonsai community on the type of bonsai soil mix to use.
I do not think there is a lot of conflict about what type of mix to use. There may be disagreement on which components should be in the mix. However, well-draining is a general consensus
Many growers find that bagged potting soil is usually satisfactory for potting most bonsai plants,
I have hardly ever encoutered a serious bonsai grower that thought generic potting mix is a suitable substrate
whereas others are convinced that only a proprietary bonsai soil mix will do.
This I may agree with, although the characteristics of the mix are important. Not what the intended use is. (I do realize that people frown at using a cactus mix for bonsai, even thoughh it is a near-perfect mix)
www.bonsaiempire.com/#f you use bagged soils, make sure they contain sphagnum peat moss and coarse perlite in equal quantities.
This is complete nonsense