I disagree. If a wearable garment were the aim of the pattern companies, they would not give instructions to press seams, understitch, trim and clip seam allowances, etc., or use interfacing at all where heavier fabrics are recommended, since none of these are necessary to produce a wearable garment. As it is, they do make all these recommendations and, often, make a specific recommendation for vilene or similar interfacing. This is not a question of tailoring, just laziness of the pattern companies/designers in not updating their advice to reflect the changing materials available.