The only solutions I could offer reddit specifically for this problem would be to deny people from modding more than one default subreddit, and maybe making a limit of, say, ten to twenty total subs you can moderate.

I think the problem with that is that it disregards the very wide range of subs and types of moderators out there. Different subs have different requirements for moderation, and different mods do different things. It's like a "zero tolerance" policy at schools - it refuses to consider context.

I'll disclose that I mod a lot of subs myself, just to share my perspective. Nearly all my subs are TV subs. They are dead for 80% of the year and so it is actually quite easy and not time consuming to effectively moderate them. If the show finishes its run and it wasn't a juggernaut like Breaking Bad then the sub is pretty much dead from thereon out, with very little moderation needed. Even the one default I mod (/r/television) takes relatively little work to manage effectively, though it is a low traffic default, the point remains. For my subs I am often the one doing the majority of the work - discussion posts, flair, sometimes CSS, and so on. And as I said, different mods do different things. Some mods only do CSS and are kept on the team, others do modmail, others get spam. When you divide duties like that and have a consistent role across subreddits, it can become easy to moderate while having tons of subs.

If that rule was applied to me, I'd have to abandon most of my subs and just hope that someone else steps up to manage the subreddit well. Which doesn't always happen. There are plenty of poorly run TV subreddits and that's basically what first motivated me to get involved. Most of my subs are also not active at all - just names for potential future TV shows. I try to snap them up because otherwise they get squatted by people who will never do anything with them, even to make into a show for the sub, so you have to do something like /r/ShowNameTV which is harder for people to find.

I'll also freely admit the domains I mod aren't exactly important. There's only so much I could censor on /r/television if I wanted to (and the other mods would notice and not like that). It's not like I mod /r/news which for some people is their main source of news.

At any rate, the article comes off as the author tooting their own horn to an extent. Blogs good! Reddit comments bad! It's only like maybe 15 minutes a day for me to mod my subreddits. It'd take more time if I wanted to strictly regulate content, but I don't do that. Even for anutensil, if you check the subs they mod, they drop off to being small subs very quickly where you can go weeks without needing to actually moderate a single thing.