a katyusha and panzer werfer is a blob killer. it does not wipe squads, but it does fucks an area up, causing tons of damage to a massive blob. it is controlled by scatter and has a wide impact area, so to prevent insta wipe on individual squads, but fucks a blob enough because of the wide space the blob occupies.
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Uhm Katy and Werfer barely deals any dmg after the nerf and they can only be effective if you park very close to the front => super risky. Getting the Stuka means u delay armor, countering Stuka with light vehicle like T-70 or AA HT and you spread out the map because If OKW get a Stuka they got no mobile AT, with fuel convert also means they barely got any muni to get shreck let alone mines.