most positive depiction of cybernetics in the franchise
I don’t think the OT is negative about cybernetics on it’s own. As I edited into my initial post, Luke’s robot hand isn’t treated as sinister. When he puts it on it’s playing jovial music. In ROTJ it’s used as a symbol that he’s repeating the trauma inflicted upon him by Vader. It’s not necessarily the hand itself but the context paired with costuming symbolism.
In the OT, Vader being a cyborg is used to make him more imposing, not less. Vader is such a force to be reckoned with because not only is he powerful in the Force but because of his cybernetics he can do things like lift a grown man off the ground with one hand. It doesn’t explicitly neuter him, and is used to make him a greater villain, not lesser. Which is why I say Canon Vader is more like OT Vader in spirit.
Also, Lobot is a cyborg. Basically, cybernetics aren’t inherently bad, it’s about who’s using them, and they aren’t a weakness.
But in the prequels, it straight up has ableist undertones. Both Grievous’ cowardly nature and the retcons he does to Vader where he’s weaker because he’s a cyborg are both in the service of “prosthetics bad”. And there’s no characters framed as completely good that are cyborgs. Maybe Lucas had the same opinion when making both, but it doesn’t surface in the OT in an inherently negative light.