Some kits only have those oak sawdust packages. I think one of the reasons is that oak gives depth and flavor, but also takes a while to age out if overdone. Those kits are "quick", so the wine is drinkable within about 3-12 months.
I have purchased more expensive kits that take a couple of years to age and they came with oak staves, or spirals, for oaking in secondary.
Some wines have a very oaky flavor, while some don't, so it also could be that your kit variety isn't a traditionally oaky wine.
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Broken Leg Brewery
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