I can see four possible uses for a .25 springer.
1. It could be fun learning the trajectory.
2. Older shooter with dexterity issues.
3. Small yard pesting if that’s your jam.
4. You just want one because you can.
You missed a couple.
5. A perfect rifle for shooting squirrels in heavy timber.
6. A perfect rifle for hunting small game in heavy brush.
7. A great caliber if you want to anchor squirrels with body shots instead of watching them run away to die with your 0.177 because you placement wasn't quite perfect or a gust of wind caught your pellet.
8. A perfect caliber for stand hunting anything at known ranges., Holds it's energy farther than any lesser caliber.