I'm not sure it is needlessly pedantic.
> In other words, maybe its undermining our current system by actually being more technically democratic.
I think OPs point is valid if the algorithm is really just giving humans more of what they want. In other words, if the engagement metric really is responding to how humans prefer to spend their time, this really is a view into what a more technically democratic society looks like.
Personally, I don't like the idea of that and would prefer the thought that these algorithms really are measuring the wrong thing!
To highlight the point I'm making, assuming the above is true, your stance could be summed up as: "yes, humans prefer this content, but we know better and will make the right decision on their behalf"
To re-enforce a sibling comment, being able to choose your own algorithm is exactly how you tease apart these two takes. Twitter supports this (chronological vs. engagement) - I personally opt for chronological. I'd be interested to see the stats on usage of that!