Yes I think that both perspectives are involved and important:
Epicurus would not have taken the philosophical position in support of pleasure that he took unless his position was provable as true by observing the real world practical benefit.
And at the same time:
Epicurus would have rejected the real world practical benefit of pleasure (just as we sometime choose pain over pleasure) if he had been philosophically convinced that a greater benefit were achievable either now or after death by following supernatural religion or "virtue" or "rationalism."
You've got to have both perspectives because they go together and reinforce each other.
One without the other is much more vulnerable to attack. Together they withstand both "practical" and "philosophical" attack.