>anything more cucked
Just a reminder: Cucked means getting sexual pleasure from seeing another man sleeping with your wife or girlfriend. This isn't the case here, even metaphorically or by any stretch.
>designing, building, tuning and programming a girl for at least 20 years
- The development takes many years, and it will always go on in a way. However, this is not about one specific robowaifu but about the technological framework.
- Many guys nowadays get into their 80s or 90s. We even have a chance to live much longer in the future. One reason why any guy should want robowaifus to exist is that you could look like Yoda from Star Wars, being 500 years old, and have at least one or more of such animated doll which look just around legal age for humans.
- You are implying that she would have sex after the owner is gone, and that she would stay around. This has never been the consent here. Even if she would stick around for longer, maybe because of the children, she wouldn't get another man. Even if she would get another man, with the permission of the original owner, it's not cuckholdry. It's just a common problem that terms get a broader and broader meaning, mostly for the goal of manipulation. In which you failed.
>who loots her from you
Security mechanisms for that will be necessary anyways, not just in case the owner dies. Unlike women, robowaifus will not be "war brides" or just be with the man who stole her. She could even have a mechanism to lock down her private parts or sending the body into self-destruct using the batteries or additional fuel e.g. Thermite (probably not Termites, lol).