restrict commenting or voting to subscribers only.
Feeds subscribe you to those communities. Maybe if the feature didn’t do that it would make more sense but with the current way things work it would require a different solution. Personally I strongly believe in granular control over to which feeds the community gets added with default opt-in where mods can react if something unwanted starts happening.
How’d you follow a feed to regularly visit if not without subscribing to it? The person you responded to complained that communities may get unwanted traffic if they were included in bad feeds. So while you suggested subscribers only comments and it would work for ‘all’ feed to filter out low effort trolls it wouldn’t work with feeds where they are already subscribed to it.
Just like with communities where you don’t look them up each time you want to see their content and you subscribe to them to have them easily accessible on you subscribed list or in subscribed feed the same would go for feeds.
I may have missed your subtle suggestion somewhere about changing the behavior of feeds in which case the feature would check out although that would cause some friction still when it comes to ease of interaction.
E:
The conversation isn’t about fair users anyway. If someone comes in without care about community talking bs then it wouldn’t matter if you gave them option to avoid it because they would do it anyway. Just like people don’t bother with block feature which there always was.