Imo, preserving is its own hobby. Beef jerky, biltong, pemmican, sauerkraut, kimchi, fruit leather, jams.

My reasoning: brewing beer is considered its own hobby by most. But it could technically be part of culinary preserving fermenting (yeast) beer.

Sourdough is also in fermenting (yeast) as is wine, but people don't expect a hobby beer brewer to try them out as well.

So within preserving we have fermenting (yeast), fermenting (lactobacillus), drying, canning, pickling, smoking,?salt brining, etc.

Culinary is so big, it's like art. If I want to learn calligraphy, do I have to do portraits, photography, music and poetry too? Just a thought.