  The confrontation between the superconducting fluctuations and percolation
effects as the origin of the in-plane paraconductivity in cuprate
superconductors was earlier addressed at a quantitative level in the case of
the optimally doped YBa$_2$Cu$_3$O$_{7-\delta}$ (YBCO) compound. Using in-plane
resistivity data from a high-quality YBCO thin film, we will extend these
analyses to high reduced temperatures, in the case of the
Gaussian-Ginzburg-Landau (GGL) approach for the conventional superconducting
fluctuations, by considering the total energy cutoff. These data will also be
analysed in terms of the mean field-approach of the effective-medium theory, to
probe if emergent percolative effects may account for the resistivity rounding
above $T_c$. Our analyses confirm earlier conclusions: the measured
paraconductivity cannot be explained in terms of emergent percolation
processes, but it may be accounted for in terms of the GGL approach. These
results also call into question alternative scenarios, including a recent
proposal derived from emergent percolative effects.
