Not all cultivars of Japanese maples will have a similar growth habit. And it also depends on where the graft is located. Low branching is a common characteristic of the vast majority of JM cultivars. If you want a tree with a clear straight trunk, look for cultivars that naturally assume that habit or purchase one with that potential that will not need pruning or staking to achieve.

'Olson's Frosted Strawberry' will never get to be a large tree (considered a dwarf, reaching about 6-8' at maturity) and has a semi-weeping habit. A single, clear trunk is not likely something that is easily trainable. Nor necessarily desirable. One of the most appealing features of JM's is their very sculptural and often asymmetrical growth habit. A straight, clear trunk is the exception, not the norm, and is often out of character with the tree and its typical growth habit.

As to Japanese maples "pre-shaped by the nurseries", I know of no reputable commercial grower of JM's that follows this practice, although many do stake their young trees to develop a more vertical growth habit. But just as many only stake the trees to prevent breakage and other damage during transport and shipping.

'Olson's Frosted Strawberry' will never get to be a large tree (considered a dwarf, reaching about 6-8' at maturity) .

I would pay to see an OFS of this height! Just curious if anyone here has such a specimen?

(I have had one for 5 seasons. It is always healthy but I swear has not grown more than a few inches...remaining less than 2 feet in height).