Carbometalation of alkenes
Alkenes are very capable of a similar carbometallation reaction as you can see in the scheme below (ref: R. M. Sultanov et al. / Tetrahedron Letters 54 (2013) 6619–6623):



I think the reasons why such reaction with alkenes is not so common is:


It is useless (correct me if i am wrong). Hence the reason why the work in the scheme above was published in a low impact journal. Why would anyone want to make alkanes in such a complicated way instead of just getting them from crude oil for example?
With alkenes, the reaction prefers to keep incorporating alkene to form really useful dimers or polymers. If one takes a look in the step wise mechanism of olefin polymerization (e.g. Ziegler-Natta) and dimerization the transmetallation/insertion step is equivalent to the one in the question posted: