IMPORTANT STARTING POINT:
I'm not actually disputing that having an android army would be an interesting and worthwhile idea. What I
am disputing is that it acts as a "hard counter" to the Enemy, or to our problems in general. Especially since there are strong indications that some of the Enemy's abilities involve magic or other 'exotic' weird effects, so that they are probably not
strictly limited to the palette of skills a ki user has.
Even more importantly, Androids can not be detected with ki sense (yet). We could make an army of them without worry of the enemy sensing them.
We might have been better off never doing any combat training and just working on tinkering.
...
[closes eyes]
Okay, for one, you're building a very large supposition on the detailed interpretation of that individual passage. For all I know, it was a throwaway line by Poptart or one they've since changed their mind on, because we've ALSO had it said that Garenhulder technology is about on the level of Earth's except for certain specific areas that were neglected or developed a bit harder. Things like Gero's infinite energy reactor may not be a part of the Garenhulder tech list after all, at least not to our knowledge.
Secondly, it is entirely possible for threats to overtake us while we're working on plan "conquer the galaxy with an army of robots." So no, neglecting our combat training to the point where we become squishy until our robots show up down the line sounds unwise. Remember what happened to the
original Dr. Gero, and for that matter his transplanted brain. Namely, splattering happened.
Nothing about Androids says they must have been built by Saiyans. Even if they are sensed that does not mean there are Saiyans here.
It does, however, increase his motive to investigate the planet. Remember that we
know the Enemy wants to exterminate all saiyans, but it may well be that this is merely one part of a broader agenda like "kill all beings and races that have the potential to surpass and destroy me." Rapid escalation of android technology would be just as much of a potential "these guys could get stronger and stronger until they kill me" problem as a bunch of saiyans.
And
yes, I know, it's bad idea to apply "no limits" reasoning. My point isn't "well, the Enemy may have no limits." My point is that we shouldn't simply assume that we can have androids demonstrate as much power as we want without someone noticing; that would
also be "no limits" reasoning.
We could get surgery and load ourselves up on some of those infinite energy reactors and never run out of ki.
Assuming that the Garenhulders have,
specifically, the infinite energy reactors... And that seems a bit unlikely given that their technology isn't obviously future-sci-fi-post-scarcity. It folds back into my question to Poptart earlier.
Also, I suspect that implanting an infinite energy reactor isn't just a matter of simple surgery, but requires reconstruction of much of the body and replacement of a lot of flesh with metal. Remember, of the three infinite energy androids, one was literally just a big metal construct and the other two were cyborgs so heavily altered that relatively little of their original bodies remained- obviously
some (e.g. Android 18's ability to have children) but not necessarily a lot. There'd be some pushbacks to us experimenting on
ourselves by implanting a lot of cybernetics, and for that matter on implanting large groups of others with heavy trial-and-error problems.
Note that we have confirmation that the Androids survived and are relatively active in the wider galaxy. This would point to the fact that the Enemy can't sense them, or at least make that fact much more plausible.
This is true. On the other hand, it may also be that the Enemy simply hasn't devoted time and effort to hunting them down, because he doesn't consider beings of that power level to be a potential problem. Saiyans have a known habit of exceeding all limits if you give them enough time; the history of power level growth on Garenhuld tends to suggest that if the Enemy
hadn't destroyed Earth, there would be a lot of saiyan descendants who by now be attaining godlike power levels in considerably greater numbers, possibly enough to threaten the Enemy.