I'm not sure I agree with that assessment. The competitor rubbers are very long lasting as well. Certainly close to if not the same life as D09c. At half the price they only need to last half as long to justify the value. However they last much longer than half the life therefore I would never buy or use D09c.
I'm not a Butterfly user or seller, but I agree that Butterfly rubbers last longer.
MX-P is considered the closest to T05, in some markets MX-P does better than T05 in terms of user's response.
However, for many high level players, they change rubbers every month.
So longevity of the rubber has never been a factor for many that commented.
It is normal that ESN rubbers after 1 or 2 months of usage, the performance will drop a great deal (this is where the booster is gone or the booster has gotten to the topsheet and changed the quality of the topsheet)
Whereby the Butterfly rubbers would last longer.
This is pretty much a known fact, but as I mentioned ,if you are changing before that date, it is fine to use (and cheaper too).
For the ones that can't notice a difference, then I think it is okay to use.
But for the ones that want that 80%+ performance for a long time, then one could weigh in higher price Butterfly versus few lower priced other rubbers.
I know people who use rubbers for 1 to 2 years, and are okay with it too. So, its just relative to each one's preference.