Not trends. Not rebadged Alibaba units. Every product below is a category where the market leader has a real, nameable, fixable flaw we can engineer past, then wrap in a moat, at a ~$200 hero-product price. Each card names the incumbent, the flaw that opens the door, the genuinely better product we build, and the moat that stops a Shopify cloner copying us next week.
The leaders survive on the "gel tax" and clinical ugliness. Beat them on honesty, design, and a certification they can't casually claim.
No 510(k) moat here and you don't want one. Win on a business-model wedge, a genuine mechanism, or a consumable the incumbent can't retrofit. Claims stay strictly cosmetic / relaxation.
Owners spend without a ceiling when it's safety or their senior dog. The best moat in the whole round lives here: a crash certification.
Viral appliances with loud, moldy, cracking, or overpriced incumbents. Fix the one thing everyone complains about, then lock in the consumable.