It's not like the amount of effort he put into it is required to make it useful. Even if you can barely push objects off the table, if you're clever you can find some good uses for your skill. And if you continue polishing it as you age it's bound to be very handy.I find it odd how many of these stories feature skills that are godlike with some effort, but never get recognized as more than it's base point. Do none of these folks ever try?
Nobody ever put effort into these abilities in the history of the world till now?
And I get that he needed 2000 years to master it, but still... It always seems weird how these abilities can be recognized as pure crap by everyone until the MC manages to put effort in or use creative thought and "oh my, suddenly it is good".
I'm overthinking it, but it is the core concept of alot of these.
So you can poke things with magic. The first thing that comes to mind is poking someone's brain with it, making them nauseous and probably puking. And this one is obvious, surely you can find many other uses even outside of combat.
Besides, his effort was achieved through a complete lottery. This manga is not really any different from any other where the MC gets an OP skill/item/knowledge through sheer luck. And nothing he did is achievable through normal means by anyone else.