Why has hurricane season 2020 produced such a large number of named storms compared to major hurricanes?

So far we have had 26 named storms, 10 hurricanes, yet only 3 majors (though I suspect Epsilon will be upgraded at the next advisory). In terms of named storms we could very well break the record this season, but the storms that have formed have largely struggled to become major hurricanes. 

2005 produced 4 category 5 hurricanes and two of those were sub 900 mb,  180+mph super-hurricanes. Even 2017 (which produced "only" 17 named storms) had more "power" than 2020 on metrics that take into account storm intensity rather than count (ACE)

3 majors is actually around dead average. 

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