I would tend to agree.
Polyurethane is a coating- it lies on the surface of the wood and isn't actually absorbed by the wood grain like a stain.
As you correctly state, uneven stain absorption is the bane of stock finishing.
With a poly, it's easier to obtain an even finish.
And if it scratches, lightly sand, and slap on another coat.
The downside would be lack of hardness and durability. Tung oils, like Tru-Oil, provide build and protection, in addition to the waterproofing.
I've got a stock for another Mosin-Nagant project rifle I'm about ready to finish and I'm going to use West System epoxy with the clear hardener and a flattening agent to kill the gloss. Not easy to apply, but you can't beat epoxy for durability where coatings are concerned.
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