It sounds like the restrictions are primarily related to supply, as in they aren’t being provided in enough quantity.
The expectation is that Zelensky gets a steady flow of new arms after the first salvo. I’m sure he’s afraid of getting cut off. But, again, why have them if you aren’t going to use them? Its not like the Russian military can get any more aggressive in Ukrainian territory. And the Ukrainians clearly aren’t shy about retributive invasions on the northern side of the front.
I doubt any of these are in a range of Russian indirect fire teams.
Russian drones and missiles have hit as far west as Lviv. And Ukrainians have sent long range artillery all the way into Moscow, abet without significant damage.
They can’t just launch strikes indiscriminately. But we’ve seen a slew of security breaches on both side of the line since the war started. If you’re just putting these weapons in a shed somewhere, they’re going to be identified eventually. Its use’m or lose’m.