Can boost and spindash coexist in the same game?

[Tornado]

*facehoof*

You know, I would respond in a somewhat mean-spirited way, but I'm tired and I'm not entirely sure you would even get what I would end up saying, so I'll just quote people:

Running headfirst into an object of superior mass at high speed and expecting it to just bump aside without harming you makes even less sense.

But much, much, much more important is this post:

Game design comes before real-world logic. If real-world logic gets in the way of good gameplay, realism gets the axe.

Which basically invalidated everything you've said so far nearly two pages ago.