Perhaps it was a design decision, perhaps it was simply oversight.
I notice that the CP has two kinds of light cruisers, both with the same icon, apparently. However there is an important difference between the two. The first batch (the one you mostly start with as independent units) do NOT consume cohesion. This is a very important difference as the only limitation for their operations is supplies (if you have that consumption ON). The second batch, the ones you have in your main fleets and you construct yourself are normal 4-ship cruiser squadrons that behave as expected.
I noticed this difference when I put one of my beaten raiding cruisers for repairs and the F2 screen showed that THAT kind of cruisers were in -4 in the Force Pool. I think there should be a distinction in these two units. The first one should be kept 1, max 2, elements and the aforementioned cohesionless behavior to abstract the raiding autonomous cruisers, and the second one the normal "tactical" cruiser squadrons.
Perhaps we need to make some balancing force pool adjustments, as well as unit-type improvements. My suggestion is to decrease the force pool for tactical cruisers and increase that raiding cruisers so when the CP loses some, at least he can recruit some more (and given they will be 1-2 elements only, they should be constructed rather quickly).