Most people on this thread have some good indications as to why this is the case, but I'll try to clear up the confusion as best as I can.
It’s true that not all rifles are built the same! Broadly speaking, the Skin is compatible with rifles that simply shoot bullets. This compatibility stems from internal back-end weapon types, weapon animations, and Skin complications with certain alt-fire modes affecting gun performance.
This means any beam weapon, launcher, bow, shotgun, speargun, armcannon, crossbow or projectile based weapon is not compatible. Additionally, some alt-fire modes on these rifles will also make the skin incompatible with those weapons - similar to the Oscira Assault Rifle skin.
The Soaktron skin will remain compatible with most assault rifles. Considering the vast amount the changes would affect internally - we do not have any current plans to overhaul the Soaktron Rifle Skin.
I hope that helps! Thanks for your understanding.
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