Why do you need an app to guide you through cooking?
Why would you buy a kitchen appliance that requires an app in the first place? Optional, sure. Required? Fuck no.
Your concerns of software support are valid. Typically the companies lose interest within 5 years in my experience.
Also I have no idea what appliance this is in the picture. Is this a stand mixer? Combined with a scale? And an induction cooker? Just buy one of each and save a pile of money and hassle. Integrated devices never do anything well.
I guarantee this hardware will fail within 10 years. Your 30 hand me down probably has no digital circuits in it, it's all mechanical and easily repaired.