here's a thread link, v below v, discussing the pros and cons of those friction causing long nosed Cable Housing End caps.. i am not a fan of them, as i've found that they cause more issues than they solve... others have their opinions, and there are specific situations where they reduce cable wear. They collect dirt in the tiny tubes and hold water in the housings.
i also feel that their presence creates false expectations of cable longevity, leading to one of the worst, most epic, struggles known to bicycle mechanics... the notorious broken brifter cable removals.
one poster reports a shop that has kept all the broken/ruined brifters caused by this failure... it's a large collection.
best plan.. change your cables more frequently.

Would you put a cable ferrule with a tail at the shifter end?