“Perhaps you like math...”
“...the second best thing for you to do is to solve intergral equations...”
“...So you are now reduced to performing differentiation, your third favorite thing. The after life is still good, but after only 20,000, you after life quality is significantly diminished.”
“And as time goes on, you see that you will be reduced to doing things that you are increasingly less enthusiastic about doing...”
A lot of assumptions there. Like assuming that whatever things you liked during your wisp of time on Earth are all you will “like” in the afterlife. That would be like a four year old thinking that he doesn’t want to become an adult because he would be bored doing adult things since everyone knows the only thing worth doing is playing on his scooter, or perhaps riding that red bike with training wheels.
Also, the “as time goes on” assumes the afterlife is bound within the constraints of time as it was when on Earth.
Finally, your thought process seems to be bound by the dimensions you have learned while on Earth, when in the afterlife you very well may find your new “reality” to be much less constrained.
Sure, we all will make certain assumptions when speculating about the afterlife, but why limit yourself to those assumptions that make it an undesirable “place” to be?
In the end, it really doesn’t matter what we speculate the afterlife to be, it will be what it will be, regardless of our speculations.
ah yes, the ‘others know better than you what you like’ is the idea that gave us obamacare.