isn't there a way to alter the age/size of l'homme so he can be a child first and then grow up?

drawn

ATM, there are no morphs available make L'Homme a child.  Scaling the model is one alternative but you'll need to simulate the body type of a child.

I got it solved by drafting body BEN, who seems good for the tasks...

what is l'homme dev good for? changes?

Development rig is for creating clothing content.

behold: why just for daz?

Because the market for L'Homme is minuscule. Feel free to contact vendors ( check what vendors even make content for L'Homme at all) and suggest they make it,  see what they say.

ok, the women are sexy and the males are hairy-legged, but still , I mean...

You can't have everything.  Either you compromise on the model selection or you create your own.  As Rhia474 mentioned, the product must be market-viable and in high demand.   The time invested to develop such products must yield a high return in the marketplace, otherwise, the vendor wastes time and effort to make a profit.  The product you cite may still have a viable market because users are still invested in Genesis 3 Male.  But that is being overtaken by Genesis 8 & 9, and who knows if you will find this particular product in the bargain basement soon.

Meanwhile, hopefully, L'homme 2 will spark renewed interest and more content when it is released.

aye aye!