Newcomers to OOB note-
Unlike campaign play, standalone scenarios allow us to buy exactly what we want, so in that respect they're ideal for newcomers to learn on, for example I've been buying loads of T-34's even though historically they weren't available in some early time periods or in certain regions.
So when I play the scens in the future I'm going to make them more challenging by restricting myself to what I can buy historically
I already do that in other DLC's, usually by rolling a dice for each purchase so that I never know what the dice is going to give me, and have the challenge of having to make do with whatever I get. The dice is therefore like High Command, sending us what's available.
Example- a dice roll of 1/2 would allow me to buy a T-34, but if 3/4/5/6 comes up I'll have to buy a lighter T-26 or BT-7.
Same dicing can also apply to which types of planes/artillery/troops etc i'll get.
"I have set my life upon a cast, and will stand the hazard of the die"- Richard III
Below- I'm sure this BT-7 crew would rather have had a T-34..