I'm 100 % convinced that not only Cuban cigars can benefit greatly from long time aging. But, the cigars must have "the raw materials" needed to age with beauty and not end up as more or less tasteless cellulose.
In 2006 I put away some cigars for long time storage:
15 Camacho Corojo Diploma
10 Davidoff Brobergs 125th Anniversary LE
20 Don Lino Africa Punda Milia
20 El Rico Habano Rico Club
19 Famous Nicaraguan 3000 (1st release) Torpedo
20 Famous Nicaraguan 3000 (2nd release) Toro
25 La Eminencia Fancy Cubanitas maduro
15 La Flor Dominicana Double Ligero Chisel
_5 Oliva Master Blends 2 Torpedo
_5 Oliva Master Blends 2 Robusto
_5 Oliva Master Blends 3 Torpedo
10 Partagás Serie P No. 2 (Cuban)
10 Perdomo 2 Torfecto
24 Ramon Allones Specially Selected (Cuban)
20 Rocky Patel Sungrown Factory Select Petite Corona
All cigars were put in zip-loc bags minimize the gas exchange and exposure to oxygen. The purpose is to slow down the rate of aging processes to optimize the result and also hopefully not loose all of the power and fullness the cigars had from the beginning.
Since then, my taste have changed somewhat and I will start a new "time capsule" this summer containing only full boxes and bundles of for example Illusione 68, Camacho Corojo Monarca natural, RP The Edge Sumatra Torpedo, JR Ultimate Cabinet #10, El Rico Habano Gran Corona natural, El Rey Mundo Flor De Llaneza natural ad perhaps some more Cuban RASS.
My belief is that there is no reason to age mild cigars since they will became almost tasteless after long time storage. I also believe that cigars with maduro wrappers have less potential to develop in a positive way compared to natural wrapped cigars. I do not have any evidence for this but I always find natural cigars more complex compared to maduros and I think that the risk of ending up with bland cigars after aging is bigger with maduro cigars!
This said, I want to add that I seldom enjoy Cuban vintage cigars. I have tried some that were truly great but honestly, most tasted grass and cardboard to me! The reason I put away cigars the way I do is to secure at least a smaller stash 10-20 years in the future when I'm not sure that we still will be allowed to buy tobacco legally at all!