I've also found it useful as a play feature.
Example: I want to buy a new ship at Shinrarta, but of course it's a permit-locked system so I can't fly my Carrier into there. (Even if I could, I'm sure it would be full of people camping there, but that's another story). So I park the Carrier in a nearby system and fly a small ship in to Jameson Memorial.
I buy my new ship. I fly it back to my Carrier. Yes, I could summon my old ship (still at Shinrarta) once I have landed on my Carrier, but why not do it myself and save a bit of money? So I use an escape pod, arrive in the concourse at Shinrarta (the last place I was docked at) and visit the shipyard wallah, set my ship that's still at Shinrarta as my current ship, walk down to the turbolifts to the hangar, and fly the ship back to the Carrier. All cosy.
Of course, this could all be avoided by being able to use an Apex shuttle to and from a Carrier. But we can't, unfortunately.
A similar trick can also be used when exploring. One of my ships is a DBX that is fitted out for long-range travel, so it's lightweighted; it has a FSD that is fully-engineered for range; fuel scoop; SRV hangar; AFMU; repair limpets; a yellow paint job; the works. If I'm going to set off on an exploration voyage in my Carrier, I can fly to the edge of the Bubble and lauch my DBX, and land it at a station. I can then summon another small ship from the Carrier and fly that one back to the Carrier, then set off on my voyage leaving the DBX behind at the station. The last safe place visited is now that station. As I travel further and further out, I can recall the ship to the Carrier and reposition it as required.
Now, if for some reason I need some kind of external help (and I don't have any friends so that option is off the menu), I now have a ship that is not tied to the carrier and exists independently. At any time, then, I can use an escape pod and retrieve that DBX. Say my Carrier is stuck somewhere and needs Tritium, or there's a component I need and for whatever reason my fleet can't meet that need. Anything can happen in deep-space exploration; who knows? The existence of that ship gives me options. And because I haven't used the Carrier for deep-space exploration yet, there could be all kinds of things that might happen, things I haven't thought of or prepared for, and like I said that DBX (and therefore the escape pod) gives me options.