Why exactly did the use of Greek letters as names for Hurricanes happen the first place, despite the fairly obvious and predictable impracticalities?
Well for one major reason, the assumption was that seasons with so numerous hurricanes were rare. Canonically, tropical cyclones typically follow a Poisson Distribution. If you consider that, of the English alphabet, only 21 of 26 letters are used for names, and if you assume that the average number of hurricanes from the past decade were to stay unchanged compared to this decade (155 tropical storms/10 years= 15.5 tropical storms per year), then the probability of going over 21 tropical cyclones is about 6.96%. Such a view is backed up by the World Meteorological Organization.
But if you say, &quot;aren't the number of tropical cyclones supposed to increase under climate change?&quot; to challenge my assumption of constant tropical cyclones per decade, I will argue that canonically, the frequency that tropical cyclones form should decrease, but the intensity should increase. So the assumption doesn't actually hold, but should actually overestimate the probability of more hurricanes in the long term.
So why use Greek letters? Well, to be consistent, something has to be used to draw attention to the storm. Cycling back to the A's sends the wrong message. And the Greek alphabet was used previously, without major consequence.
Arguably, it may be easier to only name storms that make hurricane strength. However, that would be inconsistent, and may miss strong, rain-heavy storms. For example, Tropical Storm Allison was retired without making the hurricane wind requirement.