Why the investigation pertaining to sharp estimates in diffusion pde is important? In what scenarios the quantitative way reveals important nuances of a problem and play a decisive role in a finer analysis of a model?

For example, in [https://arxiv.org/pdf/2006.03894.pdf][1] - the authors consider the following problem:  let us consider a bounded domain $\Omega \subset \mathbb{R}^{n}$ and a positive number $T$, then in $\Omega \times (0,T)$ the locally bounded solutions of the inhomogeneous porous medium equation
$$
u_{t} - \operatorname{div}(m\lvert u \rvert^{m-1}\nabla u) = f \in L^{q,r},\quad m>1
$$
are locally Hölder continuous, with exponent 
$$
\gamma = \min \Big(\frac{\alpha^{-}_{0}}{m}, \frac{[(2q-n)r-2q]}{q[mr-(m-1)]} \Big)
$$
where $\iota^{-}$ means that we can select all $s \in (0,\iota)$ and $L^{q,r}$ is a Lebesgue space with mixed norm (see the paper above for more informations)

So, why find this $\alpha$ which is a sharp exponent is so important and what applications we can obtain from the quantitative Holder regularity perspective?


  [1]: https://arxiv.org/pdf/2006.03894.pdf