It was like that in HoI III with lend lease, but the devs were unhappy with that. Rather than that (unrealistic and unbalanced) approach they decided to let you send real equipment with lend lease which can potentially intercepted by the enemy, so it isnt a 100% safe way to support other nations. I highly disagree that basicly giving away factories should be possible, since that would make lend-lease rather pointless and would make convoy raiding very easiely avoidable.
What if you could send IC at a reduced effeciency, and also it had to be shipped if possible.
We understand it, we just think it's a bad gameplay element.
Lend lease in HOI3 worked like that, and I feel like it wasn't good for the game at all.
I don't think it was great either, but i'd still like a real currency that could be exchanged, and they said civi factories are basically that currency now, though political power like someone suggested would be a really good thing too.