That's not true. There's one bot that routinely posts to news communities called "MicroWave" and there are consistently people engaging with its posts.
It probably doesn't make much sense to mirror /r/technology to /c/technology since that community is already popular and self-sustaining on lemmy.
There are countless other 'niche' communities that have no posts for months, however. There already isn't anyone engaging in these communities and it's unlikely that that will change because nobody wants to manually make posts that next to nobody is going to see. It's cyclical.
I recommend not letting the "wisdom of the crowd" dictate your decisions in the computing space, even with Linux.
Most of these people don't really know what they're talking about and are doing whatever they think will make them look good in front of their peers.
Try to see things for yourself and gain your own knowledge. Theory is no substitute for experience, but the average computer user doesn't understand that.
I say this, because I've come across genuine morons who live in Texas and have the nerve to scoff at florida while ignoring their shithole state and the one directly to the east of it.
Texas gun law requires going through a bit more effort to legally buy handguns instead of long guns, so this is very plausible.