That is my current understanding and I am in agreement with your view.
Hybrids as we understand them are about mixing up genetic code bases.
That can be done with or without genetic engineering. Most geneticist know that species have in built gene mechanisms to prevent hybrids from forming in most circumstances. But if you are aware of the problem you can get around it and produce a hybrid.
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But the ET understanding of hybrids is that if you change the genetic/organic base you seem to also affect it's development in terms of mentality and feature sets. (OA: Organic Algorithms)
That in turn affects the functionality and feedback system to the "spark" of that living presence.
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Now you can also go about it a different way. You can have a standard human being and adapt them with invisible hardware and pre-programmed structures with interfaces that aren't technically in physical spacetime as we understand it.
The problem is how useful, purposeful or good the end result is. Are these hybrids? No, not technically if seen from a physical perspective.
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I think the big problem is maybe expected roles of modified individuals of various categories. (hypothetically speaking)
A genetic base modification to a human offspring is okay if you want to propagate a variant of a human being.
But it might not be very useful by itself. Bolting on features like multi-layer interfacing and group work/tasks or approximate intelligence enhancement might be useful, purposeful.
Though if you need a genetically mixed starter base to create more refined variations of a hybrid you might not need to necessarily experiment with interfacing on each and every candidate. You'd probably pick certain groups of people in a given set of criteria that represent the whole and test out various improvements while the rest could be treated and simply baby makers.
Once the functioning and feature sets are up to part across a representative group of the whole, you'd have statistics on what you can expect down the road. Then make a refined batch for specific purposes with full features and functionality (The children?). Then probably roll out the final revised hybrids capable of at least the most agreeable performance levels as the base for mass production.
I'd suppose they'd be capable of autonomy in some sense and capable of breeding and at least (one hopes) capable of proper resemblances of human-esque behaviors while (probably) secretly being capable of a more broader level of functionality compared to a standard human being.
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I don't know of course, maybe the end result is to fail as a human being. LOL. Could be. (just kidding to any hybrids out there)